Should have refers to a missed opportunity, an unfulfilled obligation. Should have is often expressed as the contraction should've, especially in speech. Should've sounds perilously like should of, however should of is not correct and
grammarist.com
Should have, should’ve or should of
Should have refers to a missed opportunity, an unfulfilled obligation.
Should have is often expressed as the contraction
should’ve, especially in speech.
Should’ve sounds perilously like
should of, however
should of is not correct and should never be used. Contractions have been around as long as the English language, many examples exist in Old English. Interestingly, while the use of contractions has always been popular in spoken English, there have been periods in history when the use of contractions in written English was frowned upon. Today, contractions such as
should’ve are not generally used in academic and scientific writing, but may be found in more informal methods of written communication.