Still is used to say that an action or situation is continuing. It is in the present not the past. It is placed in the middle of the sentence.
Examples:
The surgeon is still operating on the girl injured in the car accident.
When I came home, the traffic was still very heavy.
Does your mother still want to come and see the children this afternoon?
Yet
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Yet is used when asking if something has happened or not happened. It is mainly used in questions and negative sentences, and is usually placed at the end of the sentence.
Examples:
Has the nurse arrived yet?
I haven’t been examined yet.
The dentist hasn’t yet decided if he wants to take out the tooth .
Have you finished reading the update yet?
Comparison of Still and Yet
Compare the use of still and yet in the following sentences.
Examples:
Is it still snowing?
Has it stopped snowing yet?
John was very late going to bed last night and he is still asleep.
John was very late going to bed last night and hasn’t woken up yet.
Still can also be used in negative sentences, where the sense is more emphatic.
Not……anymore, not….any longer and no longer are used to say that a situation has changed. Anymore and any longer are placed at the end of the sentence.
Examples:
He isn’t in the same lectures anymore (any longer).
I don’t drink milk anymore (any longer), I found I have an allergy
No longer usually goes in the middle of the sentence.