How to approach it is a complicated problem.是什么从句呀?另能举例下HOW引

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How to approach it is a complicated problem.是什么从句呀?另能举例下HOW引导从句的用法么?

主语从句.How + to do sth (不定式),表示怎么去做事情.How to approach it这个how引导的从句有作为is a complicated problem的主语,所以叫主语从句.整个句子的意思是：这么去接近它是一个复杂的问题.
再如：I don't know how to solve this problem.我不知道怎么去解决这个问题,这个how引导的是宾语从句,他作为know的宾语
how除了加不定式还可以直接加句子.I don't know how he arrived there.我不知道他怎么到那的（可能是乘飞机,乘火车什么的）,这边是一个句子he arrived there,也是宾语从句
你可以比较下,有问题,可在线问我的,多做练习就知道了
再问：主语从句的话应该有两个主语，两个谓语，这个没有的嘛，只有一个谓语动词；不是从句吧？
再答：这个用的是how+不定式，相当于一个句子，这是一个特殊的用法。其实原来的句子可以这样理How we can approach it is a complicated problem. 你记住就好了，原则上是要两个主谓形式，但是这边用到了一个动词不定式，就这样

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