3. To read this book is interesting.

4. It's important to play sports everyday.

5. It is not easy to learn English.

6. Hearing what she says clearly is impossible.

7. We are going to play volleyball this weekend.

8. My family intends to go Sapa this summer.

9. It's good for your health to do morning exercises everyday.

10. It's unhappy to get a bad mark at any subject.

11. Mr Huy is too old to drive a car.

12. My younger sister isn't 'big'/'tall' enough to wear that T-shirt.

13. It's too cold for us to go out now.

14. The visitor spoke too quickly for me to understand what he said.

15. I can't prepare dinner for my family because there isn't any rice left.

3. Interesting reading this book

4. It's a very important everyday sport

5. It's difficult to learn English

6. My hearing was poor when I heard her speak

7. This weekend we intend will  to play volleyball

8. My family intend to go to Sapa this summer

9. It's good for your health when you do morning exercise every day

10. It is not fun when all the subjects are badly scored 

11. Mr Huy cannot drive a car because he is old

12. My sister can't wear that T-shirt because my sister is young

13. Now it's very cold we can't go out

14. I don't understand what the visitor said when he spoke quickly

15. I cannot prepare dinner for my family because there is not a single grain of rice left