It's fun to do sth.是将动词不定式做了主语,那么该动词不定式能改成动名词吗,为什么?

问题描述:

It's fun to do sth.是将动词不定式做了主语,那么该动词不定式能改成动名词吗,为什么?
因为It's fun to do sth=To do sth is fun.
那么有没有It's fun doing sth呢?
另外,Eating food is good for your health能不能改为It's good for your health eating food.

不能.因为It's fun to do sth是固定搭配.To do sth is fun是动词不定式做主语的用法.
然后你改的句子也不对,要么改成It's good for your health to eat food.
也是固定搭配:It's good for sth /sb to do sth
你记住这些固定搭配就行了!