=>
A/
1. These machines haven't been used for a long time.
2. The gifts have just been opened by Jack.
3. The contract has just been signed by the manager.
4. He has been invited to lunch by Mary.
5. The students' test has been done for 4 hours.
6. Has the result of my test been known yet?
7. Many trees have been planted in the garden by my father lately.
8. Tom has been operated by the doctor since 7 p.m.
9. Her plans haven't been changed so far.
10. Jane's lessons have been studied for 2 hours.
Bị động HTHT
(+) S have/has been V3/ed (by O)
(-) S have/has (not) been V3/ed (by O)
(?) Have/Has S been V3/ed ((by O)?
B/
1. It rained all night, which made her upset.
2. I bought a cell phone which I can use to send and receive message.
3. The girl who is afraid of wasting money has never used the computer.
4. The man who came to my house last night is a computer expert.
Which -> đtqh chỉ vật/thay thế cả mệnh đề
Who -> đtqh chỉ người