$2$. Lan has studied English since 2007

$3$. We started learning E 4 years ago

$4$. He started living in HA noi when he was 8

`->`S + has/have + Ved/3 + since + mốc thời gian ( thì HTHT )

`=` S + started + V-ing + time + ago ( thì QKĐ )

`*` Giải thích:

`-` S + started/began + Ving/to Vinf + thời gian trong quá khứ

`-` S + have/has + Ved/V3 + for/since + thời gian trong quá khứ

`-` Chủ ngữ He/she/it chia với has

`-` Chủ ngữ I/we/you/they chia với have

`-` since + mốc thời gian 

`-` for + khoảng thời gian 

`*` Đáp án:

`2` Lan has studied English since 2007

`3` We started learning E 4 years ago

`4` He started to live in Ha Noi when he was 8