Perfect Modals

They shouldn't have divorced. (But they did.)
| Express
REGRETS about past actions: SHOULD
HAVE + PAST PARTICIPLE I
should
have studied more. (But
I didn't.) |
|
SPECULATE about the past: WOULD
HAVE, COULD HAVE, MAY HAVE, MIGHT HAVE + PAST PARTICIPLE
I should have married Susan. I
would
have been happy. |
| Draw
CONCLUSIONS about the past: MUST
HAVE + PAST PARTICIPLE He has just bought two Mercedes and a huge house. He must have won a lottery prize. |