what you should do is try to do everyting well
问题描述：
what you should do is try to do everyting well
为什么加what?
答
这个句子本身有点小问题.
what you should do is TO try to do everyting well.
其中what you should do是主语,is是谓语动词,to try to do everyting well是不定式短语作表语.