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it在定语从句中怎么用

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it在定语从句中怎么用
it在定语从句中怎么用
这个问题太笼统了,能说的详细点吗?
看定语从句中缺少什么成分来决定关系词的选择,而it是人称代词,作主语或者宾语.但是从句中关系代词作主语和宾语时就不能使用it了.
如:正确:The pen which I bought yesterday is blue.
错:The pen which I bought it yesterday is blue.
再问: 我做题时基本上遇不到it引导的,它和what、which等有什么区别吗
再答: it 是人称代词,不可以引导任何从句的。 而what 和which 是可以引导名词性从句的。而且which可以引导定语从句。
再问: the flood and the effects it caused were so servere that over 1000 people lost their lives. 这是不是从句
再答: The flood and the effects it caused were so servere that over 1000 people lost their lives. 在这个句子中,it caused是定语从句,其关系代词因为作宾语所以省略了。补充完整就是: The flood and the effects (that/which)it caused were so servere that over 1000 people lost their lives. 所以此句中,it是人称代词做定语从句中的主语。 希望能帮到你~