We should think about what we can do ____________ (keep) animals and plants from becoming endangered.用所给动词的适当形式填空.答案是to keep,我想知道为什么加to啊?

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Weshouldthinkaboutwhatwecando____________(keep)animalsandplantsfrombecomingendangered.用所给动词的适当形式填空.答

We should think about what we can do ____________ (keep) animals and plants from becoming endangered.用所给动词的适当形式填空.答案是to keep,我想知道为什么加to啊?
We should think about what we can do ____________ (keep) animals and plants from becoming endangered.
用所给动词的适当形式填空.答案是to keep,我想知道为什么加to啊?

We should think about what we can do ____________ (keep) animals and plants from becoming endangered.用所给动词的适当形式填空.答案是to keep,我想知道为什么加to啊?
答案：to keep
语法：不定式表目的
翻译：我们应该想想要做点什么来（为了）预防动植物的灭绝.
例句：Chinses government take many active measures to overcome financial crisis.中国政府采取了很多积极措施来克服经济危机.

to do 。。。不定式做宾语，这是正常句型

think about (sth.) to do sth.
这里的(sth.)就是we can do, 后面跟的to do和think about是一体的.

因为不定式做定语，做WHAT 的定语

加 to 表示目的，后面整个构成目的状语

to keep动词不定式在这里表目的，我们应该想想我们能做些什么来使动物不受到危害。

这里是不定式做宾语补足语，而且如果不加to，句子中就出现两个动词：do和keep

加to表示目的

动词不定式：to +动词原形
动词不定式表示目的！

不定式表目的

what we can do 我们做些什么 可以看作是宾语
后面用to do 做目的状语

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