(+) I have gone to my school
I have been to London twice
I have lived in London for 5 years
We have just finished unit 8
I have already had dinner
(-) She hasn't watched this film several times
This is the first time I haven't eaten Chinese food
I haven't studied English since I was 5 years old
I haven't stidied English for 6 years
Ly hasn't had dinner yet
Mình ko đủ thời gian để làm nghi vấn nha ! SORRY Bạn nhìu

1-I have learnt English for 6 years
=>I haven't learnt English for 6 years
=>Have you learnt English for 6 years?
2-She has already finishied her homework
=>She hasn't finishied her homework yet
=>Has she finishied her homework yet?
3-He has met me since last week
=>He hasn't met me since last week
=>Has he met me since last week?
4-We have been pen pal for two years
=>We haven't been pen pal for two years
=>Have you been pen pal for two years?
5-They have been friends since they left school
=>They haven't been friends since they left school
=>Have they been friends since they left school?