1. Nam will send the letters next Sunday.

→ The letters will be sent by Nam next Sunday.

2. Daisy was watching the film at 3 p.m yesterday.

→ The film was being watched by Daisy at 3 p.m yesterday.

3. Her teacher gave me a pen last month.

→ I was given a pen by her teacher last month.

4. She is decorating the house.

→ The house is being decorated by her.

5. It is very important to study the lesson.

→ Studying the lesson is very important.

6. They thought that you were selfish.

→ It was thought that you were selfish.

7. Who gave you the book?

→ Who was the book given to you by?

8. Nobody meets her.

→ She isn't met.

9. People have never seen dragons.

→ Dragons have never been seen.

10. They hardly meet me at the beach.

→ I am hardly met at the beach.

11 We have to learn the grammar hard.

→ The grammar have to be learned hard by us.

12. She often sweep the floor every morning.

→ The floor is often swept by her every morning.

13 No one can do the exercise.

→ The exercise can't be done.

14 .They knew that he stole the car.

→ It was known that he stole the car.

1.The letters will be sent next Sunday by Nam.(bị động thì TLD)

2.The film was being watched at 3 p.m by Daisy yesterday.(bị động thì QKTD)

3.I was given a pen by her teacher last month.(QKD)

4.The house is being decorated.(HTTD)

5.It is very important that the lesson is studied.

6.It was thought that you were selfish.

7.By who was you given the book?(QKD)

8.She isn't met.(HTD)

9.Dragons have never been seen.(HTHT)

10.I am hardly met at the beach.(HTD)

11.The grammar has to be learnt hard.(Modal V:have to)

12.The floor is often swept every morning.(HTD)

13.The exercise can't be done.(Modal V:can)

14.It was known that he stole the car.