$1. $ Hoa has taught at school for 2 years 

$→$ S + began / started + to V/ V-ing + time ago

$→$ S + have/has + P2 / been Ving + for / since ...

$2. $ Although he is rich, he is very mean 

$→$ Although/ though/ even though + S + V (chia theo thì thích hợp)

$3. $ Many trees are planted along the road

$→$ Câu bị động thì HTĐ : S + is/am/are + Vpp + (by O)

$4. $ HCM City is less beautiful than Ha Noi city

$→$ So sánh hơn kém : S + V + more/less + adj/adv + than + N/pronoun

$5. $ Nga enjoys chatting English with foreigners

$→$ S + enjoy(s) + Ving

$→$ S + tobe + interested in + Ving

`@Chamian`

1. Hoa has teached at school for 2 years 

Giải thích: thì hiện tại hoàn thành ( S + have/has + Vpp)

2. Although he is rich, he is very mean 

Giải thích: Cấu trúc Although + S + V, S + V +….

3. Many trees are planted along the road

Giải thích: Câu bị động

4. HCM City is less beautiful than Ha Noi city

Giải thích: so sánh kém hơn

5. Nga enjoys chatting English with foreigners

Giải thích: Enjoy+ Ving