1.表示对过去的推测：may have done>might have done(语气渐弱)
could have done ,不能用在肯定句里表示推测,
能用于否定句表推测,可以有 couldn't have done 表示对过去否定的推测
2.虚拟语气： could have done 本能够
might have done 本可以
may have done 不能用于虚拟语气
这三者有什么区别may have donemight have donecould have done
5个回答
相关问题
-
should have done ;could have done; might have done 有什么区别
-
should have done 和have done有什么区别
-
may have been 和may have done的区别,特别是may have been doing和may h
-
have done和have been done有什么区别呢
-
can have done和 could have done有什么区别?
-
have done.have been done .had done.had been done 有什么区别?怎么用?有
-
couldn't have done和mightn't have done有什么区别
-
should have done 和 ought to have done 有什么区别呢?
-
非谓语动词中being done ,done,having been done,have done 有什么区别
-
have been done , have been doing ,have done的区别是什么