2. how long, how often, how soon

　　how long指多長(zhǎng)時(shí)間,主要用來(lái)對(duì)一段時(shí)間(如three days, four weeks 等)提問(wèn)?如:How long ago was it? 這是多久前的事了?

　　how often指每隔多久,主要用來(lái)對(duì)頻率副詞或狀語(yǔ)(如once a week等)提問(wèn)?如:—How often does he come here? —Once a month. 他(每隔)多久來(lái)一次?每月一次。

　　how soon指再過(guò)多久,主要用來(lái)對(duì)表示將來(lái)的一段時(shí)間(in an hour, in two weeks 等)提問(wèn)?如:How soon can you come? 你多快能趕來(lái)?

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