1. I finished my work at a about five o'clock

=> My work was finished at about five o'clock

2. we use this book in our class

=>This book is used in our class

3. They gave him a nice present when he retired.

=> He was given a nice present when he retired.

4. he opened the boxes and took out a cigarettes

=> The boxes were opened and a cigarettes were take out by he

5. do people speak english all over the world?

=> Is English spoken by people all over the World?

6. somebody planted this tree last month

=> This tree was planted last month

7. they built this house in 1995

=> This house was built in 1995

8. you must answer all the questions on the paper.

=> All the questions must be answered on the paper

9. someone is singing an english song.

=> English song is being sung by someone

10. we have learn english for five years.

=>English has been learnt for five years

1.My work was finished at about five o'clock.

2.This book is used in our class.

3.A nice present was given him when he retired.

4.The boxes was opened and took out a cigarettes by him.

5.Is English spoken all over the world?

6.This tree was planted last month.

7.This house was built in 1995.

8.All the questions must be answered on the paper.

9.An english song is being sung .

10.English has been learnt for five years by us.