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how far .how long .how soon .how often .这四个短语有什么区别呢?

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how far .how long .how soon .how often .这四个短语有什么区别呢?
一、how long的用法 how long有以下两个主要意思:1.表示多长时间,主要用来对一段时间(如three days,four weeks 等)提问.如:A:How long did he stay here?他在这儿呆了多久?B:About two weeks.大约两个星期.A:How long does it take to get to London from here?从这里到伦敦要多长时间?B:At least ten hours.至少要10个小时.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:A:How often does he come here?他(每隔)多久来一次?B:Once a month.每月一次.A:How often do you visit your mother?你多长时间看你妈妈一次?B:Once a week.一周一次.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:A:How soon will he be back?他要多久才回来?B:In an hour.1 小时以后.A:How soon shall we know the results?我们多久能知道结果?B:I don’t know.我不知道.四.How far 和How long 的区别 A:持续多长时间(多久) how long How long have you been here?For five months.长度(多长) how long How long is the bridge?It’s 500 metres.距离(多远) how far How far is it from here to the zoo?It’s 6 kilometres