You can use yet after expressions which refer to a period of time, when you want to say how much longer a situation will continue for. Unemployment will go on rising for some time yet Nothing will happen for a few years yet They'll be ages yet
If you say that you have yet to do something, you mean that you have never done it, especially when this is surprising or bad. She has yet to spend a Christmas with her husband He has been nominated three times for the Oscar but has yet to win
despite anything to the contrary (usually following a concession); "although I'm a little afraid, however I'd like to try it"; "while we disliked each other, nevertheless we agreed"; "he was a stern yet fair master"; "granted that it is dangerous, all the same I still want to go"
Any one of several species of large marine gastropods belonging to the genus Yetus, or Cymba; a boat shell
You can use yet to say that there is still a possibility that something will happen. A negotiated settlement might yet be possible. = still
used in negative statement to describe a situation that has existed up to this point or up to the present time; "So far he hasn't called"; "the sun isn't up yet"
used after a superlative; "this is the best so far"; "the largest drug bust yet"
up to the present time; "I have yet to see the results"; "details are yet to be worked out"
You can use yet to introduce a fact which is rather surprising after the previous fact you have just mentioned. I don't eat much, yet I am a size 16 It is completely waterproof, yet light and comfortable. = but
You use yet after a superlative to indicate, for example, that something is the worst or the best of its kind up to the present time. This is the BBC's worst idea yet Her latest novel is her best yet. one of the toughest warnings yet delivered