need doing ,need to be done,need to do 三者的区别?

题目

need doing ,need to be done,need to do 三者的区别?
讲的要详细点.

答案

need to do是需要做某事的意思.need为实义动词,作为实义动词时主语与补语为主动关系时接to do.为被动关系时接doing或to be done.所以need doing与need to be done是同义的