I. Đổi những câu sau đây từ chủ động sang bị động.
1. He does his exercise every afternoon.
His exercise is done every afternoon.
2. Somebody calls me every day.
I'm called by somebody everyday.
3. Sam cleans the floor twice a day.
The floor is cleaned by Sam twice a day.
4. We eat a chocolate cake.
A chocolate cake is eaten.
5. They sell this house.
This house is sold.
6. William writes a letter.
A letter is written by William.
7. She washes the dishes every day.
The dishes are washed everyday.
8. Everyone sings this song.
This song is sung by everyone.