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1. Letters are typed in the office by Mary.

2. These postcards are sent to us by our friends.

3. Is English taught here by them?

4. Where is English spoken?

5. Were some exercises given by the teacher?

6. The window was broken by the boys.

7. Where was your wallet found?

1, Mary types letters in the office. *

⇒ The letters were typed in the office by Mary

2, Our friends send these postcards to us.

⇒ Them were received those postcards by their friends

3, Do they teach English here? 

⇒ She asked me if they were teach English here

4, Where do people speak English? 

⇒ He asked me Where people were speak English 

5, Did the teacher give us homework?

⇒ He asked me If the teacher was give them homework 

6, The boys broke the window

⇒ The window had broken by the boys

7,Where did you find your wallet?

⇒ She asked me Where I was find my wallet