`4.` We haven't seen him for nearly two years.

`5.` It's years since I enjoyed myself so much.

`6.` It's over 20 years since he came back to his home village.

`7.` We have lived here for fifteen years.

`8.` Is this the first time you have played a computer game?

`9.` I haven't seen him since I was a student.

`10.` They haven't left their homeland for over two years.

`11.` I haven't seen Bob since I was in Ho Chi Minh City.

`12.` This is the first time I have seen that man here.

`13.` The last time Hoa was seen was her birthday.

`-` Bị động QKĐ:

`@` S `+` was/were `+` Vpp ( `+` by O )

`----------`

`@` It's `+` khoảng thời gian `+` since `+` S `+` V_ed/V2

`=` S `+` have/has (not) `+` for khoảng thời gian / since `+` S `+` V_ed/V2

`=` The last time `+` S `+` V_ed/V2 `+` was khoảng thời gian ago

`=` S `+` last `+` V_ed/V2 `+` khoảng thời gian ago

`@` This is the first time `+` S `+` have/has `+` Vpp 

`=` It's the first time `+` S `+` have/has `+` Vpp