He has been there for six months.has been后面为什么不加to?还有为什么要加for呢?

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He has been there for six months.has been后面为什么不加to?还有为什么要加for呢?
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He has been there for six months.has been后面为什么不加to?还有为什么要加for呢?
He has been there for six months.has been后面为什么不加to?还有为什么要加for呢?

He has been there for six months.has been后面为什么不加to?还有为什么要加for呢?
因为to是介词,在和副词there连用的时候必须省略,介词不能与副词连用