Bị động - các thì:

- Thì QKĐ: S  +was/were + V3/ed 

- Thì HTHT: S + has/have + been + V3/ed 

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EX2:

1. I was introduced to Dr Felix last year.

2. A birthday party was held by my sister yesterday.

3. My car was stolen last week.

4. Sally wasn't invited to the party.

5. The phonograph was invented by Thomas Edison in 1877.

6. Two children were found in the forest by the police.

7. That book was written by Henry years ago.

8. The boxes were moved away from the window.

EX3: 

1. The land next to our house has been bought.

2. The robbers have just been arrested by the police.

3. The engineer of the car has been repaired.

4. The English grammar has been explained by our teachers.

`color{orange}{~MiaMB~}`