Yet

 What is "Yet"?

In middle or end position, yet is an adverb of time. In front position, it is a linking adverb or conjunction.

1. Yet as an adverb of time

Yet is an adverb of time meaning "up to now" especially used after negatives and in questions.
"Have you done that report yet?" "No. Sorry. I haven't finished it yet.

2. Yet as a linking adverb or conjunction

Yet is also a linking adverb which comes at the beginning of a clause or sentence, and has a similar meaning to but.
He's one of the youngest players on the field, (and) yet he can do wonders with a football.

(Yet has a slightly stronger effect than but.) We can place and in front of yet when yet comes at the beginning of a clause.

Like but, yet can also sometimes go in the middle of a phrase, for example, in linking two adjectiives.
Being a miner is an unpleasant, yet important job.
This chair is old, yet very comfortable.

Here yet behaves like a conjunction.

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