1·she（ has studied ) English for 5 years.
she hasn't studied English for 5 years.
Has she studied English for 5 years?
Yes,she has .
No,she hasn't.
2`he( has ) already ( been ) there for ten years.
he hasn't been there for ten years yet .
Has he been there for ten years yet
Yes,he has .
No,he hasn't.
3`They (hasve known )me since 1990.
They haven't known me since 1990.
Have they known you since 1990?
Ye,they have.
No,they haven't.
加油!不明白再问!