Question

It's adj. for sb. to do It's important for us to

It's adj. for sb. to do
It's important for us to
It's very kind of you to do sth.
求完整解释

Answer 1

it's adj. for sb. to do sth. 是一个固定句式，意思是某人（sb.）做某事(sth.)是怎样(adj.)的 或者是对谁来说某事是怎样的。it's important for us to do 意思是我们做什么事是重要的，比如说It's important for us to study English.意思就是对于我们来说学习英语很重要。这个句式中it是形式主语，真正的主语是to do sth.。而it's very kinf of you to do sth.也是固定句型，它的意思是你能做某事真是太好。It’s adj. of sb. to do sth.句型通常表示说话人对客观事件的惊讶、兴奋、懊悔、难过等感叹情绪，其实相当于感叹句。例如It's very kind of you to do that thing for me.意思是你能为我做那件事真的是太好了，表达感谢意。

Answer 2

第一个是：对某人来说做某事是……样的。
第二个是：对我们来说……是重要的。
第三个是：对你来说做某事是非常好的。