It's kind of him to help me.的主语是?to help me 为什么不是主语?

It's so kind ( )me a lot of helpa.of he to giveb.of him to give c.for him to gived.for he to give be kind to 与be kind of 的区别she is very kind to me 和 It's very kind of him to help me .一个用to 一个用of .为什么? It's kind of him to help me.的主语是?to help me 为什么不是主语? It is very kind of him to cook food for his mother.为什么用kind of It is very kind of him to cook food for his mother.为什么用kind of it's kind of和it was kind of 有什么不同如it's kind of you to do thisit was kind of you to do this it's very kind of sb to do sth it's very kind of you to help me.翻译 翻译：It's very kind of sb. to do sth. it's kind of sb to do sth it's very kind of you to give me a it's kind of you to say so it's our duty to fight___this kind of terrible disease. It's very kind of you to say so It's very kind of you to meet me.是什么意思 英语!it's kind of you to help me It's kind of you It's very kind of...