câu bị động với thì hiện tại hoàn thành
1 Nancy has paid the bill
2 I have eaten a hamburger
3 I have opened the present
4 Ann had fed the cats
5 They have not read the book
6 You have not sent letter
7 They have not caught the thieves
8 We have done our homework
9 My friend has written a emails for 2 hours
10 They had finished their work
11 Our teacher have explained the english grammar