11. How many children do they have?
12. How did you come to school?
13. How is the baby?
14. How often do you receive letters from your friends?
15. How fast did Tom drive on the highway?
16. How fast did the champion swim?
17. How long did it take you to finish your assignments?
18. How far is it from here to Nha Trang?
19. How long have your parents lived here?
20. How do they harvest their crop?
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How many để hỏi về số lượng
How + adj dùng để hỏi về mức độ
How dùng để hỏi về cách thức
How often hỏi về mức độ thường xuyên