how soon指再過多久, 主要對表示將來的時間進(jìn)行提問,比如:in an hour, in three weeks。how long表示多長時間,與延續(xù)性動詞連用,主要用于對一段時間進(jìn)行提問,常用for+時間段回答。how often主要強(qiáng)調(diào)動作發(fā)生的頻率。
How long
How long多久了(問時長),以For+時間段或since +時間點(diǎn)作答
How long did you stay here? I stayed here for two weeks.
How soon
How soon多久之后(問解決事情等的速度),用in+時間段作答
How soon will your father be back? In two weeks.
How often
How often多經(jīng)常(問頻率) ,常以數(shù)詞+ times a week(month 、year……)作答
(強(qiáng)調(diào)做了幾次)如果句子中有always, usually, often, never, once a day, twice a week, three times a year等詞時,常用how often 提問。
How often does your brother go home? Twice a year.
來源:高三網(wǎng)
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