Perfect Modals are used to express events or actions that could have happened in the past, but for whatever reason something occured that altered that possibility. For instance: “I should have locked my car doors, but I didn’t so my purse was stolen.” You can also use them in the negative form: “I shouldn’t have left my car doors unlocked, then my purse wouldn’t have been stolen.”
Perfect Modals include: could have; should have; would have; must have; might have; may have; and ought to have.
www.myenglishzone.com/Resources/Resources4.htm
www.geocities.com/ericsquire/grammar/modals3.htm
www.esl-classroom.com/grammar/perfmodals1.html
www.esl-classroom.com/grammar/perfmodals2.html
www.learnamericanenglishonline.com/Yellow%20Level/Y12%20Perfect%20Modals.html
Filed under: Grammar, Level: Intermediate
