An adverb is a word that’s used to give information about a verb, adjective, or other adverb.
When used with a verb, adverbs can give information about:
how something happens or is done:
She stretched lazily.
He walked slowly.
The town is easily accessible by road.
where something happens:
I live here.
She’s travelling abroad.
The children tiptoed upstairs.
when something happens:
They visited us yesterday.
I have to leave soon.
He still lives in London.
Adverbs can make the meaning of a verb, adjective, or other adverb stronger or weaker:
with a verb:
I almost fell asleep.
He really means it.
with an adjective:
These schemes are very clever.
This is a slightly better result.
with another adverb:
They nearly always get home late.
The answer to both questions is really rather simple.
Adverbs are often found between the subject and its verb:
She carefully avoided my eye.
They can also come between an auxiliary verb (such as be or have) and a main verb:
The concert was suddenly cancelled.
He had quickly eaten his dinner.