how long指多长时间,主要用来对一段时间提问。例如:
How long have you lived in London?
你在伦敦住了多久了?
how often指每隔多久,主要用来对频度副词或状语(如once a week等)提问。例如:
—How often does he come here?他(每隔)多久来一次?
—Once a month. 每月一次。
how soon指再过多久,主要用来对表示将来的一段时间(in an hour, in two weeks 等)提问。例如:
How soon can you come?
你多快能赶来?
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