It is good to help him我记得词组应该是good 怎么还有good to?

问题描述:

It is good to help him我记得词组应该是good 怎么还有good to?

It is + 形容 + to do是固定句型,表示.是.的
比如It is hard to solve the problem.
good for 后面要跟名词或动名词
比如It is good for you.