how long,how soon和how often都含有how,并且都和“多長(zhǎng)時(shí)間、多久”有關(guān),但它們的用法不相同.
how long意為“多久、多長(zhǎng)時(shí)間”,主要是對(duì)一段時(shí)間進(jìn)行提問,答語(yǔ)通常是（for）three days/weeks/months等時(shí)間段,它可用于各種時(shí)態(tài).
How long do you stay in Beijing every year?每年你在北京住多久?
How long have they lived here?他們住在這里有多久了?
—How long were you not at school last year?去年你多久沒上學(xué)?
—About two weeks.約兩周.
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how soon意為“還要多久”,是對(duì)從某個(gè)基本時(shí)間到將來(lái)某動(dòng)作結(jié)束或某動(dòng)作發(fā)生這段時(shí)間提問,常用在一般將來(lái)時(shí)態(tài)的句子中,其答語(yǔ)通常是“in + 一段時(shí)間”.
—How soon can you finish the work?還要多久你能完成這項(xiàng)工作?
—In half an hour.半小時(shí)后.
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how often意為“多久……次、是否經(jīng)?！?用來(lái)提問在某一特定的時(shí)間進(jìn)行某個(gè)動(dòng)作的次數(shù),答語(yǔ)通常是always,usually,often,sometimes,once/twice a day/month等.
—How often do you get to school very early?你多久早到校一次?
—Usually.通常.
—How often do you see a film?你多久看一次電影?
—Once a month.每月一次.
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自我測(cè)試 ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○
選擇填空.
1.— _______ did the meeting last?—About half an hour.
A.How soon B.How long C.How far D.How much
2.— _______ will Ezhou-Huanggang Bridge be finished?—In a few months.
A.How soon B.How long C.How often D.How far
3.— ________ will it take you to get to the post office?
—About half an hour.
A.How old B.How long C.How soon D.How often
4.— _________ do you write to your mother?—Once a month.
A.How many times B.What time is it C.How soon D.How often
5.— _______ a year does your school have sports meetings?—Twice a year.
A.How often B.How soon C.How long D.How many times
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答 案：1.B 2.A 3.B 4.D 5.A