1. How long does it  take you  go school ?
2. Annie is clever to get to the airport early
3. The plane was delayed for an hour because of the bad weather.
4. Do not open the door unless you are sure who  visitor is

Đáp án:

1. How long / it / take / you / go / school / ?

⇒ How long does it take you to go to school ?

2. Annie / clever / get / airport / early / .

⇒ Annie is clever to get to the airport early.

3. The plane / delay / for an hour / the bad weather / .

⇒ The plane was delayed for an hour because of the bad weather.

4. Not open / door / unless / you / be / sure / who / visitor / be / .

⇒ Don't open the door unless you are sure who the visitor is.