题目内容：

这两个短语怎么区别
hlpe do 和hlpe to do
sad 和 sadly

优质解答

help do 和 help to do 是一样的.但在被动语态中,to是不能省略的,比如：
I was helped to finished the work by Mary.
sad是形容词,一般用于修饰名词、代词,比如：She is sad.sadly是副词,一般用于修饰动词,比如：She sings sadly.