4. Did you tell me a lie?
=> Was I told a lie (by you)?
=> Was a lie told me (by you)?
5.They did not offer her a seat.
=> She wasn't offered a seat (by them).
=> A seat wasn't offered her (by them).
6. Is John calling the other members?
=> Are the other members being called by John?
7.Ann sometimes writes a letter to Jane.
=> A letter is sometimes written to Jane by Ann.
8.They lock the office every morning.
=> The office is locked every morning.
9. Tom doesn/t usually study English new words.
=> English new words aren't usually studied by Tom.
10.They found her house easily.
=> Her house was found easily (by them).
11.They weren/t painting the doors then.
=> The doors weren't being painted then (by them).
12.Does your sister often help you?
=> Are you often helped by your sister?
13.Are they cleaning the floor now?
=> Is the floor being cleaned now?
14.People often decorate their houses before the Tet holiday.
=> The houses are often decorated before the Tet holiday.
Giải thích:
Cấu trúc câu chủ động: S + V + O
Cấu trúc câu bị động chung: S + be + V(3)