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Perfect modals

Speculations

Regret

Making guesses, suppose something.

Structure is the same as speculations, but the modal is replaced with "should" can also be should've

Structure

Subject + modal (can be could, may or might, it varies according to the context of the sentence) + have + verb (in past participle) + complement

Negative form

Add "not" after the modal it can be abreviated into " 've "

Extra information

The modal used on the sentence depends on the context.

An example can be: Alfredo should've told his mother...

An expample can be: Joshua could've eaten my sandwich...