1. When did you first know him?

⇒ How long have you known him. 

Dịch: Bạn biết anh ấy bao lâu rồi?

Cấu trúc: When did + S + first + V?

             = How long have/has + S + P2?

              ( Làm gì được khoảng bao lâu?)

2. Their trip lasted three day?

⇒ They had a three day trip.

3. It may rain hard this afternoon, so take the rain coat with you.

⇒ In case it rain hard this afternoon, take the rain coat with you.

Cấu trúc: In case + S + V, S +V

4. She had to do the washing up but she didn't.

⇒ She forgot doing the washing up.

Cấu trúc: S + be + adj + enough for somebody / something + to + V 

               ( Ai đó quên làm gì)

5. English id easy to learn.

⇒ It is easy to learn English.

6. Don't leave the light on all nigh, you will waste electricity.

⇒ If you leave the light on all night, you will waste electricity.

Cấu trúc : If + S + Vhtđ, S + will + V ( câu điều kiện loại 1)

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