关于英语的It‘s adj.结构

题目

关于英语的It‘s adj.结构
It's adj 有时可以接to do 有时是doing.那什么时候doing.什么时候to do呢.是固定的还是其他.举几个例子
顺便说说It's adi of/for sb to do 或doing sth和上面一样吗

答案

It is +adj.(形容词)+for sb+to do sth
这些形容词有important necessaryi mpossible meaningful difficult useful easy等
例句It is difficult for you to finish the job.
It is +adj.(形容词)+of sb+to do sth
careless clever foolish good kind nice polite selfish silly wrong thoughtful wise generous rude brave
例句 It is nice of you to help me
这个句型不用ing啊,倒是有 have difficulty in doing sth这个句型