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for后面加什么时间可以吗

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or接一段时间的省略问题

一、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。如:

They lived in China (for) seven years.

The meeting lasted (for) two hours.

They will be in Chicago (for) a year.

二、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.

三、当for短语修饰动态动词时或者用于否定句是,则借此for不能省略。

I’m going away for a few days.

I haven’t seen him for three weeks.

四、当for用在句子开头时,一般也不能省略。请比较:

a. He lived abroad (for) six years.

For six years, he lived abroad.

b. He waited anxiously at hospital (for) some time.

For some time, he waited anxiously at hospital.