1. The old people should do exercise every morning.

2. He used to smoke cigarettes when he was young.

=> used to : đã từng

3. Physics has been taught by Mr. George for twenty years.

=> Bị động thì Hiện Tại Hoàn Thành

4. The boy who won the race yesterday is very happy.

=> ''who'' dùng thay thế cho ''he''

Chúc bạn học tốt!

EX1:Rewrite sentences beginning with words given:

1.

-> The old people should do exercise every morning. ( the old : người cao tuổi )

2. 

-> He used to smoke cigarettes when he was young. ( used to : đã từng )

3. 

-> Physics has been taught by Mr. George for twenty years. ( Bị động thì HTHT )

4. 

-> The boy who won the race yesterday is very happy. ( 'who' dùng thay thế cho 'he' )