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 grammatically correct and should be used when describing something that was supposed to happen in the past.
Should of is a common error often made because of the phonetic similarity to shouldve, the contraction of should have'.
Remember: shouldve is a contraction for should have—theres no place for should of.
Always use should have or its contraction shouldve' for correctness.
A way to remember is that of is a preposition, while have helps to form the perfect aspect in verbs.