Chuyển thành câu bị động

1 mrs . pile teaches us physics at school

2 How do you know him today

3 Jenny didn't put the cake on the table last night

4 John has waited for his girl friend for two hours

5 Will you finish your homework tomorrow

6 They have not used this type writter for along time

7 When did they first discover the island?

8 No one has told me about the project before

9 Everyone congratulates Jim on passing the exam

10 People have used computers since 1940.
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