<p>Good question, but it's hard to deal with all the issues your examples raise in just one answer: the complexity of this thing is really staggering.  </p>

<p>One important thing I think you are missing is that there are TWO kinds of le. This is a frequently made point; one place you can read more about this is Li and Thompson's book, Mandarin Chinese: A Functional Reference Grammar.  Their discussion is not the last word, but it's well presented and worth reading.</p>

<p>In short: the -le that comes after the verb is one thing: this is perfective -le.
The le that comes at the end of the sentence is another thing: Li and Thompson call this 'currently relevant state'. It would take <em>way</em> too much space to go over both of these here. I think a lot of your post is about the idea of perfective, so let's take that one.</p>

<p>Li and Thompson define 'perfective' in terms of the idea of boundedness. I found this useful because it identifies a common element in sentences where -le is often used.  -le says "there is a boundary here", where some event or activity ends.  For this to make sense, you have to fill in what that boundary is (very abstract, I know; sorry). What sort of things can make a boundary? </p>

<p>1) quantifying something. There's a number in there somewhere. I'll show you how this works in a minute. </p>

<p>2) definite. Often this means the object is definite, so that its <em>that</em> particular event that's over. Try adding zhe- na- etc. to your objects and you should be able to get the feel of this. </p>

<p>3) the verb is <em>inherently</em> bounded. Verbs like 'die' are like this, the verb demands that you mark it as bounded, if you don't it sounds--illogical. "To die" is the end of something by its nature. </p>

<p>4) one event in a sequence. In this case, after adding the -le to mean 'this ends', we simply look after it to see what comes next.</p>

<p>This is why example 5 does not sound complete.  adding the -le after chi means that the chi-fan activity has stopped (maybe finished, maybe not), and something else is happening.  But what?  You have to put the following activity in, or people will say "...and?"</p>

<p>If, however, you add a number, you will find you get a different response:
Ta chi-le san-wan fan is bounded by the number. The three tells you when the activity stopped.  There is nothing incomplete about this sentence at all.  The number supplies the boundary that -le promises you.</p>

<p>Hmm, didn't answer most of the question.</p>

CC BY-SA 3.0
2015-09-23T22:26:37.543Z
Yes, I know there are 2 了. The "sentential 了" is not a problem for me at all!!! (maybe since I'm russian and we have something of this kind of aspect in russian language. 

The "verbal 了"  (I made it BOLD in my question) is a really big problem! 

The perfectivness of 了 .... well that road leads nowhere. Since 过 is perfect to, and resultive verb complement (RVC), and "sentential 了". They are all perfect but the difference between them.... That is what interesting.
coobit
CC BY-SA 3.0
2015-09-24T01:32:51.660Z
Sentential le is not perfective. It can, for example, be inchoative, meaning it shows you when something starts, not ends. guo is also not perfective, in Li and Thompson's sense of being bounded. But that's the answer to a different question.
wpt
CC BY-SA 3.0
2015-09-24T02:09:12.267Z
Hm, after thinking a few minutes my comment about -guo above seems very unclear. Try this.  Ask people what they think of two sentences: 我吃了三碗飯 and 我吃過三碗飯.  This will help give you a feel for the difference between 過 and 了.  Boundedness is one way to describe this difference.
wpt
CC BY-SA 3.0
2015-09-24T05:55:02.603Z
1)'我吃了三碗飯' I ate three plates of rice. Simple fact because of **existential** character of 了. Speaker may not add any **experiential** info futher.

2)'我吃過三碗飯' 'I ate three plates of rice.' Futher speaker should\can add some description of his **expirience** 'Yes, there was such an expirience in my life, and I can add that '三碗飯' was too much for me.'

But both of these deeds are completed, finished, perfect. The difference is the character of the situation. The 1) sentence stresses **existance** the 2) sentense stresses **expirience**.
coobit
CC BY-SA 3.0
2015-09-24T08:43:35.980Z
我吃過三碗飯 is actually odd. The only way it really makes sense is as a claim about your ability to eat food; adding the phrase 曾經  helps. Cool hand Luke might say: 我曾經吃過五十個蛋.  This sentence doesn't need more info. Experiential thus means the time frame for 過 is unlimited, basically your whole life: "At least once in my life I have eaten three bowls of rice at one go." The 了 version means I stopped eating rice after the third bowl on a specific occasion. Basically, 'completed' or 'finished' don't describe 過's meaning very well.
wpt
CC BY-SA 3.0
2015-09-24T08:58:30.447Z
That's why "they" call it 過 "experiential aspect maker". But still it belongs to a perfective class.
coobit
CC BY-SA 3.0
2015-09-24T09:05:10.657Z
Ok. how would you explain such a sentence?
墙上挂了一幅画 (A picture hangs on a wall.)
1)it is in present tense (as far as I now)
2)the verb is stative in nature, so 'completion' can't explain this sentence.
3)the event is not over. so there is no bound here.
yet 了 is used.!!!
coobit
CC BY-SA 3.0
2015-09-24T11:30:54.340Z
Note I am using L&T's ideas here, not my own. 墙上挂了一幅画 works with their idea because it is quantified, hence referring to a bounded situation. 挂 is not 'stative' here, it refers to the action of hanging up a picture; one picture was hung up, just as three bowls of rice were eaten. After the event of 'hanging up' ends, the picture is 'hanging'. We could say 昨天牆上掛了一副畫, 現在還掛著. L&T avoid using 'completion' to explain 了, since perfectivity doesn't necessarily involve 'completion' Using 'boundedness' is not 'perfect' either, but it works for many cases.
wpt
CC BY-SA 3.0
2015-09-24T12:23:58.500Z
Hold on... You say "to hang up a picture" (in this case 了 is understood), but I thought the correct translation was "Picture hangs on the wall".
coobit
CC BY-SA 3.0
2015-09-24T13:38:14.297Z
牆上掛了一副畫, the 了 tells us it wasn't always there, but was hung at some point in the past; if you want to refer to the picture without mentioning that, you could say 牆上掛著一副畫, or 有一副畫掛在牆上. Use a 了, the temporal dimension is always there. Use an agent: 我在牆上掛了一副畫  and you can see both the temporal dimension and the parallel with 我吃了三碗飯 even more clearly.
wpt
CC BY-SA 3.0
2015-09-23T18:28:21.260Z
2015-09-23T18:28:21.260Z
wpt
<p>In regard to your translations, I would make the following comments as a native Chinese user based on my intuition of my first language:</p>
<ol>
<li><p>&quot;我吃饭&quot; is not &quot;I'm eating&quot;. It means simply &quot;I eat&quot;. &quot;I'm eating&quot; would be e.g. &quot;我在吃饭&quot; or &quot;我正在吃饭&quot; or &quot;我吃饭呢&quot;. Chinese is not like German in this regard, where &quot;ich esse&quot; can mean &quot;I'm eating&quot;.</p>
</li>
<li><p>&quot;我吃完饭&quot; cannot be a sentence by itself. If you want to say &quot;I have finished eating&quot;, you must say e.g. &quot;我吃完饭了&quot; or &quot;我吃完了饭了&quot;， where the &quot;了&quot;'s are indispensable.</p>
</li>
<li><p>&quot;我吃饭了&quot; can mean, as you mentioned (&quot;Now I eat!&quot; or &quot;I will eat now!&quot;), but it could also mean simply &quot;I ate&quot; in certain contexts, e.g. as an answer to the question &quot;你吃饭了吗？&quot; （&quot;Did you eat?&quot;）</p>
</li>
<li><p>As discussed before.</p>
</li>
<li><p>&quot;我吃了饭&quot; indeed sounds incomplete even though it is grammatically valid as a sentence by itself. However in certain contexts it sounds perfectly natural (and complete) as a sentence by itself, e.g. as an answer to &quot;你吃了饭吗？&quot; or &quot;你吃饭了吗？&quot;. Also &quot;我吃了饭&quot; indicates that the action of the eating of the meal has finished - it [does not] refer to a situation where a person started eating but has not finished.</p>
</li>
<li><p>&quot;我吃了饭了&quot; indeed often means approximately what you mentioned of it, except that it does not mean &quot;I was eating&quot;, but &quot;I ate&quot; or &quot;I've eaten&quot;, with the connotation that &quot;I&quot; doesn't want to eat more. But depending on context it could also simply mean &quot;I ate&quot; or &quot;I've eaten&quot; without the connotation you mentioned.</p>
</li>
<li><p>&quot;我吃完了饭&quot; also sounds unnatural as a sentence by itself, but I don't think it is grammatically incorrect - it just sounds unnatural to a native user of Chinese (at least me and I would assume most native users of Chinese I know) in most contexts. But it [can be] natural (but perhaps not [very] natural - I'm not even sure because it depends on [how] one [utters] the sentence) as an answer to e.g. &quot;你吃完了饭吗？&quot;</p>
</li>
<li><p>What you mentioned regarding it is correct.</p>
</li>
</ol>
<p>In general, you need to understand that just as in English and other languages you know, the meanings of Chinese sentences are [context dependent], especially the connotations of the sentences (and note that the context I referred to includes e.g. characteristics of the sound of one's utterance such as its tone, loudness, stress amd &quot;rhythm&quot;).</p>
<p>In regard to your additional comments:</p>
<ol>
<li>I don't see &quot;他当了兵&quot; as being complete or in some sense much more complete than &quot;我吃了饭&quot;. I see them as being almost the same in regard to completeness. I think as an independent sentence &quot;他当兵了&quot; sounds more natural than &quot;他当了兵&quot;. Similar to the case of &quot;我吃饭了&quot; as discussed before, &quot;他当了兵&quot; can be a sentence by itself in certain contexts, e.g. as an answer to the question &quot;他这几年做了什么工作？&quot; (&quot;What work did he do in these years?&quot;)</li>
<li>They are pretty much the same. I cannot think of any notable differences between them right now. I think it is safe to assume that they have exactly the same meaning.</li>
<li>Sorry, but &quot;了&quot; is indeed very much about the completion of an action. &quot;了&quot; is a [verb] which literally means &quot;to finish; to be completed&quot; in ancient Chinese. It became a particle later and the use of it as a particle is in my view derived from the intuition about the finishing of an action. For example, &quot;那我走了&quot; indeed has the meaning of &quot;Then I'm leaving&quot; or &quot;Then I'll leave&quot; rather than &quot;Then I have left&quot;. However I think here &quot;我走了&quot; really indicates, at some primitive intuitive level (speaking as a native Chinese user), the completion of [the making of the decision to leave at the moment] or that [the initiation of the action of leaving] will soon be completed. Therefore I think &quot;了&quot; here nevertheless indicates the [completion of an action]. Practically, you can simply think of &quot;了&quot; in this context (and other similar contexts) as indicating or suggesting a [change of state] of something.</li>
</ol>
<p>By the way, I'm not a linguist, so my opinions here are not academic. I merely expressed my personal reflections on this matter as a native user of Chinese.</p>

CC BY-SA 4.0
2021-02-17T13:32:47.343Z
1. 我吃饭 - should be "I eat (habitually)" Right? Like in "I eat peanuts, I don't have allergy to them".
2. 我吃完饭 - cant be a sentence by itself beacuse 我吃饭 is has a habitual reading and 我吃完饭 is perfective (that is completed) and you cannot have completed verb as a habit..  Right?
3. So 你吃了饭 in case when it is a question, is completem but not in any other case. If there some other cases, please, provide them, it's very interesting. I didn't think that 你吃了饭吗？is alright.. Strange.
4. 了 as a completion marker was debunked (it most of the times CORRELATES with completion, but not always)
coobit
CC BY-SA 4.0
2021-02-18T00:11:16.260Z
@coobit 1. Yes. I think "我吃饭" is just like "I eat" in English - I can't see any notable difference between them at the moment.
2. I agree with what you said here. "我吃完饭" is just like "I finish eating" in English. When do we ever say "I finish eating." instead of "I finished eating."? Similarly in Chinese we don't say "我吃完饭。" but we say "我吃完饭了。"
user53754683
CC BY-SA 4.0
2021-02-18T00:18:50.197Z
@coobit  3. ”你吃了饭吗?" is a perfectly valid and natural sounding Chinese sentence. 
"你吃了饭。" can be e.g. an answer to the question "我吃了饭吗？". It is just like "You ate." in English. The sentence "你吃了饭。" is grammatically valid (so it is not incomplete), but only [feels] incomplete because it is only used in very specific contexts, such as when it is used as an answer to the aforementioned question. When it is used in the proper context, it does not feel incomplete at all.
user53754683
CC BY-SA 4.0
2021-02-18T00:23:52.100Z
@coobit
4. I think I explained quite well in my answer. It is however not necessary that you understand what I wrote there if all you want is to learn how to use Chinese. I only meant to explain that, by my understanding, (most if not) all of those different ("different") meanings of "了" which are apparently unrelated to its original meaning "to finish; to be completed", are all in fact derived from the intuition from that original meaning.
user53754683
CC BY-SA 4.0
2021-02-18T14:55:08.967Z
Please, answer another quesiton about  "我吃完饭". Can we translate it like so: "I (habitualy) finish eating (meals)." That is I seldom leave any food leftovers.

Thanks.
coobit
CC BY-SA 4.0
2021-02-19T08:02:12.700Z
@coobit
No, nobody who knows Chinese would understand "我吃完饭。" to mean that. As I said in my answer, "我吃完饭" cannot be a sentence by itself. I think whether it is grammatically valid or not depends on what grammatical system one uses, but even if it is taken to be grammatically valid, it is nevertheless semantically nonsensical.
To express the meaning of "I seldom leave any food leftovers", you should say something like "我一般都会把饭吃完" or "我一般不会剩饭", which translate to English as "I would normally finish eating meals" and "I normally wouldn't leave leftovers".
user53754683
CC BY-SA 4.0
2021-02-19T08:11:42.927Z
@coobit I'm personally inclined to consider "我吃完饭" to be grammatically valid but semantically nonsensical.
user53754683
CC BY-SA 4.0
2021-02-19T09:48:22.647Z
Thanks for your answers. Really helps. :)
coobit
CC BY-SA 4.0
2021-02-17T08:24:33.330Z
2021-11-15T11:25:11.223Z
2021-11-15T11:25:11.223Z
user53754683
<p>I'm Chinese learner and as everybody else I'm puzzled by the <strong>verbal</strong> aspect <code>了</code>. My research into the subject gave such results:</p>

<ol>
<li><p><code>了</code> belongs to <strong>a class</strong> of perfective aspect markers just as many other    markers 过, verb duplication, RVC (verb resulative aspect) etc.</p></li>
<li><p><code>了</code> is a <strong>existential aspect marker</strong> (aka factual, aka actuality marker, aka reality marker). In other words <code>了</code> marks what really happened or 100%
going to happen. That's why you can't negate it with <code>没</code></p></li>
</ol>

<p>So the classical test for comprehension would be to translate following phrases:</p>

<ol>
<li><p><code>我吃饭</code>. (I'm eating). No questions here.</p></li>
<li><p><code>我吃完饭</code>. Is this unacceptable? The idea here is to tell that "I completed eating process but it is not real in some sense."  Looks like this is a part of a bigger sentence in future tense, in my opinion.</p></li>
<li><p><code>我吃饭了</code>. ("Now I eat!" or "I will eat now!"). No questions here.</p></li>
<li><p><code>我吃完饭了</code>. "Now I've eaten and completed the "meal eating" i.e. the plate is empty!" I can't feel much difference between this sentence and (8).</p></li>
<li><p><code>我吃了饭.</code> (Uncompleted sentence. "I ate."). So this states that eating took place, but no result of it is mentioned. But native spekers say that the sentence is not complete and something is missing. Why is this the case?</p></li>
<li><p><code>我吃了饭了</code>. (I <em>was</em> eating, you know! Don't give me another plate!) Negation:  <code>但是没吃完</code> (Negation is acceptable since it's negation of 完 and not of 了. (We do not negate that food eating took place, we negate that it was completed.)</p></li>
<li><p><code>我吃完了饭</code>. I have eaten and completed the action of eating. Just a fact with now connection to anything. Negation: <code>但是没吃完</code> (unacceptable) since I just stated that 完 was actualized (了)</p></li>
<li><p><code>我吃完了饭了</code>. (I have eaten and completed the action of eating by now.)</p></li>
</ol>

<p>Additional comments.</p>

<ol>
<li><p>By the way: <code>我吃了饭</code> is not complete to most Chinese natives but <code>他当了兵</code> is absolutely complete. The difference here, I guess, is inside <code>吃</code> (stative) and <code>当</code>(resultive) verbs. Any comments on that?</p></li>
<li><p>Any comments on the difference between (4) and (8) sentence would be much appreciated.</p></li>
<li><p>Please, don't tell me that <code>了</code> is about completion of a verb (it is not as <code>过</code> is about as much completed actions as <code>了</code> is).</p></li>
</ol>

CC BY-SA 3.0
2015-09-23T11:28:14.830Z
Since you mentioned 过, you can also add [我吃过](http://www.ichacha.net/%E6%88%91%E5%90%83%E8%BF%87%E4%BA%86.html).
Armfoot
CC BY-SA 3.0
2015-09-23T17:15:05.317Z
Yep, you can add 过. But I'm not ready to formulate a good question on this subject yet.
coobit
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2015-09-23T17:32:41.143Z
I meant 我吃过了 with 了 (as you can see in that link), which is yet another variant.
Armfoot
CC BY-SA 3.0
2015-09-23T22:41:11.410Z
"Completing the task" means: 
1. 吃 does not indicate any  ending by itself. So it's like 'I eat' . 
2. What if I want to tell that I've eaten **and**  have eaten everything up. That is where 吃完 comes in handy. 完 is a RVC (resultive verb complement) it adds the result to the "resultless" verb.
3. Now if i wanted to relate the eating process in 'time' (yes, i know chinese is tensless language) I need more aspects to add. '过 or 了' will do the job of time indication.
coobit
CC BY-SA 3.0
2015-09-24T05:52:48.777Z
#3 does not necessarily mean 'I'll eat now'. It means either 'I have eaten' or 'I'll eat now', but without further context, people tend to read it as the former not the latter.
NS.X.
CC BY-SA 3.0
2015-09-24T06:05:02.027Z
@NS.X. Are you native? If you are that is bad for me... I thought I got that part of sentential  -le.
coobit
CC BY-SA 3.0
2015-09-24T08:33:01.753Z
@coobit I am native speaker. Actually similar questions were asked multiple times on this site and the most recent one for your reference: http://chinese.stackexchange.com/questions/12588/how-to-spot-if-possible-if-a-final-%E4%BA%86-is-part-of-an-omitted-%E8%A6%81-in-a-%E8%A6%81-%E4%BA%86-constr/
NS.X.
CC BY-SA 3.0
2015-09-24T17:10:13.763Z
The _le_  has two different lexical entries. One is what is known as actuality aspect _le_, and the other is a final-particle.
HYC
<grammar><meaning><particles>
To 了 or not to 了
# To 了 or not to 了

(Asked by: username_0 on 2015-09-23)

I'm Chinese learner and as everybody else I'm puzzled by the **verbal** aspect `了`. My research into the subject gave such results:

1. `了` belongs to **a class** of perfective aspect markers just as many other markers 过, verb duplication, RVC (verb resulative aspect) etc.
2. `了` is a **existential aspect marker** (aka factual, aka actuality marker, aka reality marker). In other words `了` marks what really happened or 100%
   going to happen. That's why you can't negate it with `没`

So the classical test for comprehension would be to translate following phrases:

1. `我吃饭`. (I'm eating). No questions here.
2. `我吃完饭`. Is this unacceptable? The idea here is to tell that "I completed eating process but it is not real in some sense." Looks like this is a part of a bigger sentence in future tense, in my opinion.
3. `我吃饭了`. ("Now I eat!" or "I will eat now!"). No questions here.
4. `我吃完饭了`. "Now I've eaten and completed the "meal eating" i.e. the plate is empty!" I can't feel much difference between this sentence and (8).
5. `我吃了饭.` (Uncompleted sentence. "I ate."). So this states that eating took place, but no result of it is mentioned. But native spekers say that the sentence is not complete and something is missing. Why is this the case?
6. `我吃了饭了`. (I *was* eating, you know! Don't give me another plate!) Negation: `但是没吃完` (Negation is acceptable since it's negation of 完 and not of 了. (We do not negate that food eating took place, we negate that it was completed.)
7. `我吃完了饭`. I have eaten and completed the action of eating. Just a fact with now connection to anything. Negation: `但是没吃完` (unacceptable) since I just stated that 完 was actualized (了)
8. `我吃完了饭了`. (I have eaten and completed the action of eating by now.)

Additional comments.

1. By the way: `我吃了饭` is not complete to most Chinese natives but `他当了兵` is absolutely complete. The difference here, I guess, is inside `吃` (stative) and `当`(resultive) verbs. Any comments on that?
2. Any comments on the difference between (4) and (8) sentence would be much appreciated.
3. Please, don't tell me that `了` is about completion of a verb (it is not as `过` is about as much completed actions as `了` is).

**Tags:** grammar, meaning, particles

> **Comments:**
> **username_1**: Since you mentioned 过, you can also add [我吃过](http://www.ichacha.net/%E6%88%91%E5%90%83%E8%BF%87%E4%BA%86.html).  
> **username_0**: Yep, you can add 过. But I'm not ready to formulate a good question on this subject yet.  
> **username_1**: I meant 我吃过了 with 了 (as you can see in that link), which is yet another variant.  
> **username_0**: "Completing the task" means:  1. 吃 does not indicate any  ending by itself. So it's like 'I eat' .  2. What if I want to tell that I've eaten **and**  have eaten everything up. That is where 吃完 comes in handy. 完 is a RVC (resultive verb complement) it adds the result to the "resultless" verb. 3. Now if i wanted to relate the eating process in 'time' (yes, i know chinese is tensless language) I need more aspects to add. '过 or 了' will do the job of time indication.  
> **username_2**: #3 does not necessarily mean 'I'll eat now'. It means either 'I have eaten' or 'I'll eat now', but without further context, people tend to read it as the former not the latter.  
> **username_0**: @username_2 Are you native? If you are that is bad for me... I thought I got that part of sentential  -le.  
> **username_2**: @username_0 I am native speaker. Actually similar questions were asked multiple times on this site and the most recent one for your reference: http://chinese.stackexchange.com/questions/12588/how-to-spot-if-possible-if-a-final-%E4%BA%86-is-part-of-an-omitted-%E8%A6%81-in-a-%E8%A6%81-%E4%BA%86-constr/  
> **username_3**: The _le_  has two different lexical entries. One is what is known as actuality aspect _le_, and the other is a final-particle.  

---

## 2 answers

### Answer by username_4 on 2015-09-23. Score: 5

Good question, but it's hard to deal with all the issues your examples raise in just one answer: the complexity of this thing is really staggering.

One important thing I think you are missing is that there are TWO kinds of le. This is a frequently made point; one place you can read more about this is Li and Thompson's book, Mandarin Chinese: A Functional Reference Grammar. Their discussion is not the last word, but it's well presented and worth reading.

In short: the -le that comes after the verb is one thing: this is perfective -le.
The le that comes at the end of the sentence is another thing: Li and Thompson call this 'currently relevant state'. It would take *way* too much space to go over both of these here. I think a lot of your post is about the idea of perfective, so let's take that one.

Li and Thompson define 'perfective' in terms of the idea of boundedness. I found this useful because it identifies a common element in sentences where -le is often used. -le says "there is a boundary here", where some event or activity ends. For this to make sense, you have to fill in what that boundary is (very abstract, I know; sorry). What sort of things can make a boundary?

1) quantifying something. There's a number in there somewhere. I'll show you how this works in a minute.

2) definite. Often this means the object is definite, so that its *that* particular event that's over. Try adding zhe- na- etc. to your objects and you should be able to get the feel of this.

3) the verb is *inherently* bounded. Verbs like 'die' are like this, the verb demands that you mark it as bounded, if you don't it sounds--illogical. "To die" is the end of something by its nature.

4) one event in a sequence. In this case, after adding the -le to mean 'this ends', we simply look after it to see what comes next.

This is why example 5 does not sound complete. adding the -le after chi means that the chi-fan activity has stopped (maybe finished, maybe not), and something else is happening. But what? You have to put the following activity in, or people will say "...and?"

If, however, you add a number, you will find you get a different response:
Ta chi-le san-wan fan is bounded by the number. The three tells you when the activity stopped. There is nothing incomplete about this sentence at all. The number supplies the boundary that -le promises you.

Hmm, didn't answer most of the question.

> **Comments:**
> **username_0**: Yes, I know there are 2 了. The "sentential 了" is not a problem for me at all!!! (maybe since I'm russian and we have something of this kind of aspect in russian language.   The "verbal 了"  (I made it BOLD in my question) is a really big problem!   The perfectivness of 了 .... well that road leads nowhere. Since 过 is perfect to, and resultive verb complement (RVC), and "sentential 了". They are all perfect but the difference between them.... That is what interesting.  
> **username_4**: Sentential le is not perfective. It can, for example, be inchoative, meaning it shows you when something starts, not ends. guo is also not perfective, in Li and Thompson's sense of being bounded. But that's the answer to a different question.  
> **username_4**: Hm, after thinking a few minutes my comment about -guo above seems very unclear. Try this.  Ask people what they think of two sentences: 我吃了三碗飯 and 我吃過三碗飯.  This will help give you a feel for the difference between 過 and 了.  Boundedness is one way to describe this difference.  
> **username_0**: 1)'我吃了三碗飯' I ate three plates of rice. Simple fact because of **existential** character of 了. Speaker may not add any **experiential** info futher.  2)'我吃過三碗飯' 'I ate three plates of rice.' Futher speaker should\can add some description of his **expirience** 'Yes, there was such an expirience in my life, and I can add that '三碗飯' was too much for me.'  But both of these deeds are completed, finished, perfect. The difference is the character of the situation. The 1) sentence stresses **existance** the 2) sentense stresses **expirience**.  
> **username_4**: 我吃過三碗飯 is actually odd. The only way it really makes sense is as a claim about your ability to eat food; adding the phrase 曾經  helps. Cool hand Luke might say: 我曾經吃過五十個蛋.  This sentence doesn't need more info. Experiential thus means the time frame for 過 is unlimited, basically your whole life: "At least once in my life I have eaten three bowls of rice at one go." The 了 version means I stopped eating rice after the third bowl on a specific occasion. Basically, 'completed' or 'finished' don't describe 過's meaning very well.  
> **username_0**: That's why "they" call it 過 "experiential aspect maker". But still it belongs to a perfective class.  
> **username_0**: Ok. how would you explain such a sentence? 墙上挂了一幅画 (A picture hangs on a wall.) 1)it is in present tense (as far as I now) 2)the verb is stative in nature, so 'completion' can't explain this sentence. 3)the event is not over. so there is no bound here. yet 了 is used.!!!  
> **username_4**: Note I am using L&T's ideas here, not my own. 墙上挂了一幅画 works with their idea because it is quantified, hence referring to a bounded situation. 挂 is not 'stative' here, it refers to the action of hanging up a picture; one picture was hung up, just as three bowls of rice were eaten. After the event of 'hanging up' ends, the picture is 'hanging'. We could say 昨天牆上掛了一副畫, 現在還掛著. L&T avoid using 'completion' to explain 了, since perfectivity doesn't necessarily involve 'completion' Using 'boundedness' is not 'perfect' either, but it works for many cases.  
> **username_0**: Hold on... You say "to hang up a picture" (in this case 了 is understood), but I thought the correct translation was "Picture hangs on the wall".  
> **username_4**: 牆上掛了一副畫, the 了 tells us it wasn't always there, but was hung at some point in the past; if you want to refer to the picture without mentioning that, you could say 牆上掛著一副畫, or 有一副畫掛在牆上. Use a 了, the temporal dimension is always there. Use an agent: 我在牆上掛了一副畫  and you can see both the temporal dimension and the parallel with 我吃了三碗飯 even more clearly.  

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### Answer by username_5 on 2021-02-17. Score: 1

In regard to your translations, I would make the following comments as a native Chinese user based on my intuition of my first language:

1. "我吃饭" is not "I'm eating". It means simply "I eat". "I'm eating" would be e.g. "我在吃饭" or "我正在吃饭" or "我吃饭呢". Chinese is not like German in this regard, where "ich esse" can mean "I'm eating".
2. "我吃完饭" cannot be a sentence by itself. If you want to say "I have finished eating", you must say e.g. "我吃完饭了" or "我吃完了饭了"， where the "了"'s are indispensable.
3. "我吃饭了" can mean, as you mentioned ("Now I eat!" or "I will eat now!"), but it could also mean simply "I ate" in certain contexts, e.g. as an answer to the question "你吃饭了吗？" （"Did you eat?"）
4. As discussed before.
5. "我吃了饭" indeed sounds incomplete even though it is grammatically valid as a sentence by itself. However in certain contexts it sounds perfectly natural (and complete) as a sentence by itself, e.g. as an answer to "你吃了饭吗？" or "你吃饭了吗？". Also "我吃了饭" indicates that the action of the eating of the meal has finished - it [does not] refer to a situation where a person started eating but has not finished.
6. "我吃了饭了" indeed often means approximately what you mentioned of it, except that it does not mean "I was eating", but "I ate" or "I've eaten", with the connotation that "I" doesn't want to eat more. But depending on context it could also simply mean "I ate" or "I've eaten" without the connotation you mentioned.
7. "我吃完了饭" also sounds unnatural as a sentence by itself, but I don't think it is grammatically incorrect - it just sounds unnatural to a native user of Chinese (at least me and I would assume most native users of Chinese I know) in most contexts. But it [can be] natural (but perhaps not [very] natural - I'm not even sure because it depends on [how] one [utters] the sentence) as an answer to e.g. "你吃完了饭吗？"
8. What you mentioned regarding it is correct.

In general, you need to understand that just as in English and other languages you know, the meanings of Chinese sentences are [context dependent], especially the connotations of the sentences (and note that the context I referred to includes e.g. characteristics of the sound of one's utterance such as its tone, loudness, stress amd "rhythm").

In regard to your additional comments:

1. I don't see "他当了兵" as being complete or in some sense much more complete than "我吃了饭". I see them as being almost the same in regard to completeness. I think as an independent sentence "他当兵了" sounds more natural than "他当了兵". Similar to the case of "我吃饭了" as discussed before, "他当了兵" can be a sentence by itself in certain contexts, e.g. as an answer to the question "他这几年做了什么工作？" ("What work did he do in these years?")
2. They are pretty much the same. I cannot think of any notable differences between them right now. I think it is safe to assume that they have exactly the same meaning.
3. Sorry, but "了" is indeed very much about the completion of an action. "了" is a [verb] which literally means "to finish; to be completed" in ancient Chinese. It became a particle later and the use of it as a particle is in my view derived from the intuition about the finishing of an action. For example, "那我走了" indeed has the meaning of "Then I'm leaving" or "Then I'll leave" rather than "Then I have left". However I think here "我走了" really indicates, at some primitive intuitive level (speaking as a native Chinese user), the completion of [the making of the decision to leave at the moment] or that [the initiation of the action of leaving] will soon be completed. Therefore I think "了" here nevertheless indicates the [completion of an action]. Practically, you can simply think of "了" in this context (and other similar contexts) as indicating or suggesting a [change of state] of something.

By the way, I'm not a linguist, so my opinions here are not academic. I merely expressed my personal reflections on this matter as a native user of Chinese.

> **Comments:**
> **username_0**: 1. 我吃饭 - should be "I eat (habitually)" Right? Like in "I eat peanuts, I don't have allergy to them". 2. 我吃完饭 - cant be a sentence by itself beacuse 我吃饭 is has a habitual reading and 我吃完饭 is perfective (that is completed) and you cannot have completed verb as a habit..  Right? 3. So 你吃了饭 in case when it is a question, is completem but not in any other case. If there some other cases, please, provide them, it's very interesting. I didn't think that 你吃了饭吗？is alright.. Strange. 4. 了 as a completion marker was debunked (it most of the times CORRELATES with completion, but not always)  
> **username_5**: @username_0 1. Yes. I think "我吃饭" is just like "I eat" in English - I can't see any notable difference between them at the moment. 2. I agree with what you said here. "我吃完饭" is just like "I finish eating" in English. When do we ever say "I finish eating." instead of "I finished eating."? Similarly in Chinese we don't say "我吃完饭。" but we say "我吃完饭了。"  
> **username_5**: @username_0  3. ”你吃了饭吗?" is a perfectly valid and natural sounding Chinese sentence.  "你吃了饭。" can be e.g. an answer to the question "我吃了饭吗？". It is just like "You ate." in English. The sentence "你吃了饭。" is grammatically valid (so it is not incomplete), but only [feels] incomplete because it is only used in very specific contexts, such as when it is used as an answer to the aforementioned question. When it is used in the proper context, it does not feel incomplete at all.  
> **username_5**: @username_0 4. I think I explained quite well in my answer. It is however not necessary that you understand what I wrote there if all you want is to learn how to use Chinese. I only meant to explain that, by my understanding, (most if not) all of those different ("different") meanings of "了" which are apparently unrelated to its original meaning "to finish; to be completed", are all in fact derived from the intuition from that original meaning.  
> **username_0**: Please, answer another quesiton about  "我吃完饭". Can we translate it like so: "I (habitualy) finish eating (meals)." That is I seldom leave any food leftovers.  Thanks.  
> **username_5**: @username_0 No, nobody who knows Chinese would understand "我吃完饭。" to mean that. As I said in my answer, "我吃完饭" cannot be a sentence by itself. I think whether it is grammatically valid or not depends on what grammatical system one uses, but even if it is taken to be grammatically valid, it is nevertheless semantically nonsensical. To express the meaning of "I seldom leave any food leftovers", you should say something like "我一般都会把饭吃完" or "我一般不会剩饭", which translate to English as "I would normally finish eating meals" and "I normally wouldn't leave leftovers".  
> **username_5**: @username_0 I'm personally inclined to consider "我吃完饭" to be grammatically valid but semantically nonsensical.  
> **username_0**: Thanks for your answers. Really helps. :)  

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