1. will be built 2.is discussing. 3. is spoken 4.has benn not found 5.were cut 6. are told 7. must be sent 8.sell 9. are made , are made 10.be taken 11. is cleaned 12.be seen 13.have been watered 14.sells 15. has been 16.have seen, saw 17. smells 18. is dancing
6,被动语态变主动语态
1.We heard him sing songs in the next room.2.We must build a bridge over the river.3.We can not take these books out the library.4.Doctors and nurses have taken good care of these children.1. we heard him sing songs in the next room.
2.they must built a brige over the river.
3. we must take these books out of the library
4. doctors and nurses have aken good care of these children