21. They say that Mr Liu can speak German.

_________ _________ that Mr Liu can speak German.

11. Jim has stayed in the college for five years.

_________ _________ has Jim stayed in the college?

12. The twin brothers get on very well.

_________ _________ the twin brothers get on?

13. My foreign friends will arrive in half an hour.

_________ _________ will your foreign friends arrive?

14. The car near the river is mine.

_________ _________ is yours?

15. It’s very wet and hot today.

_________ the weather _________ today?

16. He is looking for a pair of black shoes.

_________ is he _________?

17. He went to the station to meet the twins last Wednesday.

_________ did he _________ to the station to meet the twins?

18. Jack has been to Hong Kong only once.

_________ _________ _________ has Jack been to Hong Kong?

19. We have a class meeting once a week.

_________ _________ _________ you have a class meeting?

20. They came to ask for help.

_________ did they come _________?

10. Too many trees are still being cut down in the USA. (改为主动句)

_________ are still _________ down too many trees in the USA.

9. Can another way be thought of to keep your wine or water warm?(改为主动句)

Can _______ _______ _______ another way to keep your wine or water warm?

8. John was seen to cross the street just now by someone.(改为主动句)

Someone _________ John _________ the street just now.

7. A birthday party will be given tomorrow. (改为主动句)

We _________ _________ a birthday party tomorrow.

6. They built a bridge between the two islands last year. (改为被动句)

A bridge ________ ________ between the two islands last year.

5. They produce silk in Suzhou.(改为被动句)

Silk _________ _________ in Suzhou.

4.The teacher made the students copy the text. (改为被动句)

The students _________ _________ _________ copy the text.

3. You can borrow two books at a time.(改为被动句)

Two books _________ _________ _________ at a time.