1. We started to study English for 4 years

2. My father has given up smoking last year

3. They started to work in that factory in 2001

4. Lan didn't write to Maryam last month

5. He started to live in Hanoi when he was twelve

6. I didn't see him a long time ago

7. I haven't seen her for 10 years 

$1$ `:` We started to study English for 4 years.

`-` S `+` started / began `+` to `+` V_inf `+` O `+` ( for `+` khoảng thời gian / since `+` mốc thời gian ).

$2$ `:` My father has given up smoking since last year.

`-` Give up `+` V`-`ing 

`->` Từ bỏ làm gì đó

`+` For `+` Khoảng thời gian

`+` Since `+` Mốc thời gian

$3$ `:` They started to work in that factory in 2001.

`-` S `+` started / began `+` to `+` V_inf `+` O `+` time ( Ở quá khứ ).

$4$ `:` Lan didn't write to Maryam last month.

* QKĐ `:`

`(-)` S `+` didn't `+` V_inf `+` O.

$5$ `:` He started to live in Hanoi when he was twelve.

`-` S `+` started / began `+` to `+` V_inf `+` O `+` time ( Ở quá khứ ).

$6$ `:` I didn't see him a long time ago.

* QKĐ `:`

`(-)` S `+` didn't `+` V_inf `+` O.

$7$ `:` I haven't seen her for 10 years.

* HTHT `:`

`(-)` S `+` have / has `+` V3 / V`-`ed `+` O.

`+` For `+` Khoảng thời gian

`+` Since `+` Mốc thời gian