It's a waste of time这个句型,急,It's a waste of time 后面加to do sth还是doing sth?到底哪个正确呢?还是两个都有?

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It's a waste of time这个句型,急,It's a waste of time 后面加to do sth还是doing sth?到底哪个正确呢?还是两个都有?
It's a waste of time这个句型,急,
It's a waste of time 后面加to do sth还是doing sth?
到底哪个正确呢?还是两个都有?

It's a waste of time这个句型,急,It's a waste of time 后面加to do sth还是doing sth?到底哪个正确呢?还是两个都有?
to do sth

DOING

加doing sth
这个比较特殊

it is a waste of time doing

我叫得两个都可用...

用doing sth.
最简单的理解办法就是做什么事情是浪费时间，并不是要浪费时间去做什么事情.

后面接doing，固定搭配

It + be + 名词词组+doing sth 固定搭配
It + be + no + 名词+ doing sth

分析一下句子结构你就明白了：It是形式主语，并非真正的主语。to do sth 或 doing sth 才是真正的主语。所以两者均可。It's a waste of time＋to do sth / doing sth 可以改为这种比较易懂的形式：
to do sth /doing sth is a waste of time 例如：
It's a waste of time wa...

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