1、用how long。How long have you lived here?I have lived here for a long time.在现在完成时出现for+一段时间,谓语动词用延续性动词。
2、当for引导的时间短语用来修饰具有静态意义的动词是常常可以省略。
They lived in China (for) seven years.
3、当for与all开头的名词短语连用时,必须省略for.
She’s been lying in bed all day.
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