1. He started teaching in this school over one year ago.

_ He has taught in this school over one year ago.

⇒ Cấu trúc: S+ have/ has+ PII

 2. When did you start learning English ?

_ How long have you learnt English.

⇒ Cấu trúc: Have/ has+ S+ PII?

3. He is painting the walls for me now.

_ The walls is being painted for me now

⇒ Cấu trúc thể bị động thì hiện tại tiếp diễn: S+ am/ is/ are+ being+ PII

4. If Lan doesn't water these flowers, they will be died

_ Unless Lan water these flowers, they will be died.

* Unless= If.....not

⇒ Cấu trúc câu điều kiện loại 1: If+ S+ V(s/ es), S+ will+ V

5. The weather is not nice, so we can not go on the picnic in the country.

_ If the weather was nice, we would not go on the picnic in the country.

⇒ Cấu trúc câu điều kiện loại 2: If+ S+ V-ed, S+ would, could,...+ V