It‘s bad for your health to drink too much.为什么要用to

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It‘s bad for your health to drink too much.为什么要用to
It‘s bad for your health to drink too much.为什么要用to

It‘s bad for your health to drink too much.为什么要用to
这是动词不定式后置,it做形式主语,真实主语是to drink too much
整句还原:to drink too much is bad for your health .

it's bad for sb to do sth是固定词组,对某人来说做某事是不好的。
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固定搭配:It's adj for...to do sth.

It is +adj+for n to do sth 是个常见的个句型。It 只是个先行词,没有意义,它代表的是to drink too much。而drink是个动词不能直接做主语,所以to+drink 充当的是的是主语。这句话也可以是TO drink /Drinking too much is bad for your health.