15. may have + 과거분사 : - 했을지도 모른다
must have + p.p : -했음에 틀림없다.
cannot have + p.p : -했을 리 없다
He may have visited me while I was out.
(내가 외출했을 때 그가 방문했을 지도 모른다.)
You may have put the key somewhere in speaking.
He must have known that he was suffering from cancer.
She cannot have done well at school.
My parents moved to New York in the early thirties. It was a long journey in those days, and it must have been a rough and tiring one.
0 분
18 분
