※ 과거형 조동사 + have + P.P

※ 과거형 조동사 + have + P.P
-크게 2가지 용법, 즉 가정법 과거완료와 가능성/추측 용법으로 볼 수 있으며
-각 용법은 문장이 사용된 맥락을 통해 구별합니다.



1. 가정법 과거완료: if 가정절 생략 용법
-형태: would/should/could/might + have + P.P
e.g.)
More passengers would have been saved.
예를들어 '좀 더 일찍 구조했다면'과 같은 가정이 생략된 구문



2. 가능성/추측의 과거
-형태: would/could/might + have + P.P

1) 일어날 가능성은 있지만 실제로는 일어나지 않은 과거의 사실
-if 가정절 생략 용법과 유사
e.g.)
I would have phoned you, but there wasn’t time.
전화 하려고 했지만 시간 없어서 안 했다는 것

It could have been awful.
끔찍할 수 있었는데 아니었다는 것

You might have found it very difficult.
그것이 매우 어려울 수도 있었을텐데 아니었다는 것


2) 사실 여부는 모르겠으나 정황 상 사실일 가능성/추측
-형태: would/ could/ might/may + have + P.P 
e.g.) 
That would have been Della's car
사실일지는 모르겠으나 댈러스의 차라고 볼 수 있는 가능성

It is just possible that such a small creature could have preyed on dinosaur eggs.
사실 여부는 모르겠으나 작은 생물체가 공룡알을 먹고 살았을 가능성

They might have moved house by now.
사실 여부는 모르겠으나 지금 쯤은 집에 도착해 있을 가능성

I may have seemed to be overreacting.
사실 여부는 모르겠으나 내가 괴잉반응 했을 가능성



Ref) 참조
Collins Cobuild English Grammar (2017): 5.137-5.139
Collins English Dictionary: https://www.collinsdictionary.com/dictionary/english/would
리사베 선생님: https://cafe.naver.com/innimlord/1724