It’s important to study English well. to study 是动词不定式,作主语。
上句也可以写成:
To study English well is important.
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追问主语doing 和to do有什么区别吗?
追答有时没有区别,如上面的Seeing is believing. 可以写成: To see is to believe. 不过主语和表语要统一。
用doing常表示泛指的一件事,to do常表示具体的某件事。如:
Swimming is one of the best sports.
To swim with you is very happy.
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