1. He said:  We must have a party to celebrate this -> He said that they must have a party to celebrate that.

2. I'm on the tenth page of the letter I'm writing -> So far I have written ten pages of the letter.

3. Minh last wrote to his pen pal five months ago. -> Minh hasn’t written to his pen pal for 5 months.

4. They usually wore jeans when they were young. -> They used to wear jeans when they were young.

5. We couldn’t go to school this morning because of the heavy rain. -> Because it was rained heavily, we couldn't go to school.

6. Practice speaking everyday or you can't improve your English. -> If you practice speaking everyday, you can improve your English.

7. Hard work is the secret of passing your exam. -> So long as you work hard, you will pass your exam.

8. You do not have to pay for elementary education in Viet Nam. -> Elementary education isn't have to be paid in Viet Nam.

9. He was a fool to say that -> It is foolish for him to say that.

10. Living in the city is exciting -> Some people find living in the city exciting.