Common Errrs - Yet

yet

adverb

1

BAD: He left the house at five in the morning, when the family was yet asleep.

GOOD: He left the house at five in the morning, when the family was still asleep.

BAD: I've only been here two weeks and everything is strange yet.

GOOD: I've only been here two weeks and everything is still strange.

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Yet means 'up to the moment of speaking' and is used mainly in questions and negative sentences: 'Do you feel any better yet?' 'The post office isn't open yet.'

When you want to say that an earlier state or situation has not changed, use still : 'I've taken the medicine but I still feel terrible.' 'Does Hilary still go to the same school?'

2

BAD: I didn't finish my thesis yet.

GOOD: I haven't finished my thesis yet.

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Yet  (= up to the moment of speaking) is usually used with the present or present perfect tense (NOT the past tense): 'Has the taxi arrived yet?' 'Is the taxi here yet?' 

3

See note at BUT (↑but)