Swimming is good for your health.换成It is引导的形式主语怎么换?

题目

Swimming is good for your health.换成It is引导的形式主语怎么换?
It is good for your health swimming.对吗？

答案

It is good for your health to swim .it是形式主语,动词不定式to swim是真正的主语 .其结构为it is +形容词+for sb to do sthIt is bad for us to danceIt is important for them to learn well...