Hỏi đáp Unit 16 Tiếng Anh lớp 8 phần Vocabulary

Change these sentences into passive:

1. Peter is writing a letter to his friend 2.My friends are making some phone calls in the evening 3.Bad drivers are causing many accidents 4.The children are eating a lot of sweets 5. Nam is repairing play piano at the moment 6.They are demolishing the entire block 7.Someone is cutting the glass now 8.That factory is producing more and more pollution 9.Someone is showing her how to do it 10.The boys are planting some trees in the garden 11.Lan was preparing that report when I came to see him 12.Waiters and waitresses were serving customers 13.The president was signing those papers 14. Was Mary helping her mother in the kitchen at that time? 15.The head teacher was making the announcement 16. Someone was cleaning the windows while I was there 17.They were preseting the athletes to the spectator when we came 18.Someone is making the coffee when I walk into the kitchen 19.They have sold their car to pay debts 20.No one has opened the window for ages. Giúp mình nhé !