how soon,how long,how often用法上有什么不同?
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how soon,how long,how often用法上有什么不同?
how soon,how long,how often用法上有什么不同?
how soon,how long,how often用法上有什么不同?
1.how soon 对(从即时起)到将来某个时刻间的时间长短提问,回答通常为 in+一段时间.如:
-How soon will you be back?
-In two days.
2.how long 对从某个时刻都另一时刻(各时态皆可)间的时间长短提问,但后跟的谓语动词必须为延续性动词,回答为 for+一段时间.也用作对长短提问.如:
-How long did he be away?(leave为短暂性动词,故换为短语be away)
-For ten years.
3.How often 对某个时段内谓语动词发生的频率提问,答语为 次数+一段时间(once a day,three times a week等),也可用never、seldom等回答.如:
-How often does he visit his grandpa?
-Twice a month.