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IvanhrYou need the present perfect in your examples. The word "yet" suggests that the process of changing your mind started some time in the past and has continued into the present. Anyway, I'd say Haven't you changed your mind about leaving yet?
mudclay Oh! really? "yet" could be only used for "present perfect"? 1) Have you eaten dinner yet?2) Haven't you eaten dinner yet? Which sentence is correct? Thank you!
Ivanhrmudclay Oh! really? "yet" could be only used for "present perfect"? 1) Have you eaten dinner yet?2) Haven't you eaten dinner yet? Which sentence is correct? Thank you!In AmE "yet" is sometimes used with the simple past. In BrE this is normally considered wrong. Both your examples are fine.