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for开头什么提问?

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关于“for”开头的疑问句,主要根据其后的时间短语类型选择合适的疑问词。以下是常见用法及解析:

一、表示时间长度的短语

How long

用于询问持续的时间段,例如:

- How long did you study for the exam?(你为考试学习了多久?)

- The movie started 2 hours ago. How long will it last?(电影2小时前开始的,会持续多久?)

How soon

用于询问将来的时间点,常与时间状语in连用,例如:

- How soon will the meeting start?(会议多久后开始?)

二、其他常见搭配

How often:

询问频率,例如:

How often do you exercise?(你多久锻炼一次?)

How many times:询问可数名词的次数,例如:

How many times have you visited this place?(你参观过这个地方多少次?)

三、注意事项

省略规则:

- 当for引导的时间短语修饰延续性动词时,for可省略。例如:

They lived in China (for) seven years. → They lived in China for seven years.

- 当与all连用时,for必须保留。例如:

She’s been lying in bed all day.

替代表达:

- 用what提问时,需借助助动词be动词,例如:

What time will the meeting start? → How long is it before the meeting starts?

通过以上规则,可以灵活应对不同场景下的时间相关疑问句。