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.