Yet refers to an action that should have happened before now but hasn’t.

I haven’t finished eating yet.
It cannot be used for the future, and it is usually placed at the end of a sentence.
• Agnes can’t go home she hasn’t finished her work yet.
• They haven’t paid me yet. • John will be here yet.
(Cannot be used for the future)
• It’s nearly 8 o’clock – John will be here soon.
(Means the plan was for John to arrive at 8pm so he is not late)
• It’s 8.10 and John isn’t here yet.
(Means the plan was for John to arrive at 8pm so he is late)
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Remember: Yet cannot be used for the future.
I am still on the toilet, so I haven’t sent your e-mail yet.
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Remember: Yet cannot be used for the future.
Don’t touch my computer. I haven’t finished with it yet.
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Vocabulary Video Lesson: Time
This vocabulary lesson will help you define birthday, date of birth, diary, calendar, time-saving, spare time, time management, time flies and timescale. (8:00)If you only have two minutes then do this lesson.
Could or able to? (2:00)