1. When does Mary play tennis at the Sport Centre? (every afternoon chỉ thời gian→ when)

2. How long did it take pop and rock groups to record their song in 1960s? (one or two days là thời gian→ how long) 

3. What is Mai going to lend you? (sự vật→ what)

4. Why was the plane delayed? (because→ why)

5. Where and when was Uncle Ho born? (thời gian và địa điểm→ where and when)

6. Who was he talking to when you met him? (the manager là người→ who)

7. What did she want to learn to have a good job? (cô ấy muốn học gì→ what)

8. What did they do to buy a new car? (họ đã làm gì→ what)

9. How much does this book cost? (5 dollars là giá tiền→ how much)

10. What is Mr.Lam's nationality? (hỏi quốc tịch→ nationality)

11. How high is the biggest building in this city? (hỏi chiều cao→ how high)

12. How long have you known each other? (thời gian→ how long)

13. Who did Minh give a rose to last week? (người→ who)

14. How many novels has he written? (số lượng→ how many)

15. What do you do in your free time? (làm gì→ what)