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How 引导的疑问词组的用法,一、how long的用法how long有以下两个主要意思：表示多长时间，主要用来对一段时间(如three days,four weeks 等)提问。Eg:I have been here for five months.How long have you been here?,2.表示某东西有多长。如：A：How long is the river?这条河有多长？B：About 500 km.大约500千米。二、how often的用法how often 指每隔多久，主要用来对频度副词或状语(如：once a week,three times a month 等)提问。如：,They come to visit me once a week.How often do they come to visit you?三、how soon的用法how soon 指再过多久，主要用来对表示将来的一段时间(如：in an hour,in two weeks 等)提问。如：He will be back in an hour.How soon will he be back?,四、how far指提问距离多远It is 4 kilometers from Beijing to Xian.How far is it from Beijing to Xian?,
