① How long，意思是“多久”，指时间的长度，一般对for或since引导的表示一段时间的状语提问。如：- How long have you been in the Party?- Since 1998.

　　② How soon，意思是“多久才能”，“要到什么时候”，指将来，一般针对“in +一段时间”或soon 等将来的时间提问。如：- How soon will he come back? – In three days.

　　③ How often，意思是“隔多久一次”“是否经常”，指频率，一般针对once a week，three times a day，often，sometimes，never等频度状语提问。如：-How often do you usually have an art class? –Once a week.

　　④ How long/ wide/ tall/ deep/ far，意思是“多长/宽/高/深/远”，一般针对带有“数字+形容词”的内容提问。如：-How deep is the river? -It’s about four meters deep.

　　⑤ How many，意思是“多少”，针对可数名词的数量提问。如：-How many books can I borrow?-Two.

　　⑥ How much，意思是“多少钱”或“多少”，针对价格或不可数名词的数量提问。如：-How much is that green dress?-Thirty dollars. 又如：-How much meat do you want?- Half a kilo.

　　练习

　　I. 用所给单词的正确形式填空

　　1. You must (try) to eat less food.

　　2. Do you have a healthy lifestyle if you (exercise) every day?

　　3. He (eat) fruit every day.

　　4. He (like) (watch) TV. Sometimes he (watch) it for 10 hours. Now he (watch) a movie at home.

　　5. She usually (exercise) three times a day.

　　6. –How often do you go to the park? - (two) a week.

　　7. –Do you like watching TV? –No, it is (bored).

　　8. How often do you eat (health) food?

　　9. She (enjoy) her meal in the restaurant now.

　　10. During his (ill), he stayed indoors.

　　II. 根据提示写出单词

　　1. Mr. Green has a f and he has to see a doctor.

　　2. The exam is very i , I don’t want to fail it.