perhapssheleftamessage(may)新概念第二册第十九课改写成以含有may的句子.perhapssheleftamessage(may)新概念第二册第十九课改写成以含有may的句子我改写成：shemayhasleftamessage.但答案给的是：she

Question

perhaps she left a message(may)新概念第二册第十九课 改写成以含有may的句子.
perhaps she left a message(may)新概念第二册第十九课
改写成以含有may的句子
我改写成：she may has left a message.
但答案给的是：she may have left message.
第三人称为什么用have啊?

Answer 1

perhaps she left a message(may)新概念第二册第十九课
改写成以含有may的句子
我改写成：she may has left a message.
但答案给的是：she may have left message.
第三人称为什么用have啊?
may 是情态动词 后面接动词原形或者 have+动词过去分词
对现在或将来的推测用“may+动词原形”; 对过去的推测则用“may+have+p.p.”(主要用于肯定或否定句)：
It may rain tomorrow.明天可能下雨.
He may have said so.他也许这样说过.
They may not have known it before.他们以前可能不知道此事.