Should have vs. Should of

Should have

/ʃʊd həv/

A phrase indicating that something was ideal or advisable in the past, but did not happen.

By now, we should have received the package.You should have asked her before making changes.They should have known the rules by now.

This word has no synonyms

This word has no antonyms

/ʃʊd əv/

This is a common mistaken contraction in place of 'should have'.

He says he should of called you sooner.You should of seen the surprise on her face.I should of known better than to trust him.

This word has no antonyms

Should have is the correct form; it includes the auxiliary verb have.
Remember have follows modal verbs like should, could, and would.
Think of should have as shouldve where have is contracted as ve, leading to confusion sometimes, but should always be should have'.
Should of arises from mishearing or misinterpreting the contraction shouldve'.
If youre expressing a condition or necessity referring to the past, always go with should have'.