Qu'est-ce que tu penses?
Qui est-ce qui vient ce soir?
Just wondering why 'Qui', which ends in a vowel, wouldn't contract when the following word begins with a vowel, as does the example with 'Que'?
In answer to your question logically, it is probably to differentiate the meanings which would be lost if you could elide both vowels -
Qu'est-ce -que ...? = What is ...?
Qui est-ce que ...? = Who is ...?
Hope this helps.
Mainly it's words ending in "e", but also "la" and "si".
The rules are explained here:
But si does not contract if the following vowel is an "e". It only contracts in cases such as si+il = s'il or s+ils = s'ils.
If you want a more complete summary on elisions, you can check, e.g.,here:https://www.lawlessfrench.com/pronunciation/elision/
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