1. Do they teach English here ?
⇒ Is English taught here?
2. Have they changed the window of the laboratory
⇒ Has the window of the laboratory been changed?
3. Will the buses bring the children home ?
⇒ Will the children be brought home by the buses?
4. How cant they open this safe ?
⇒ How can this safe be opened?
5. The police advise driver to use an alternative rout
⇒ Driver is advised to use an alternative route by the police?
6. I knew that they had told him of the meeting
⇒ I knew that he had been told of the meeting.
# Phan Anh Duy