The baby monkey and mother monkey are very happy to see them.为什么要加to?
问题描述：
The baby monkey and mother monkey are very happy to see them.为什么要加to?
答
be happy to do sth固定用法,记住就行It is very kind of Kangkang to help them.为什么也要加to?be kind of sb to do sth也是固定用法