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THE MODAL PERFECTS. FORM. MODAL + HAVE + PAST PARTICIPLE. MUST HAVE. A certainty or logical conclusion about an event in the past Rob has arrived late. He must have been in a traffic jam. MIGHT / MAY HAVE. A guess about a past action
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FORM • MODAL + HAVE + PAST PARTICIPLE
MUST HAVE • A certainty or logical conclusion about an event in the past Rob has arrived late. He must have been in a traffic jam
MIGHT / MAY HAVE • A guess about a past action She might / may have made a mistake
COULD HAVE • Ability to do something in the past which in the end was not done. You could have warned me before it happened
COULDN`T HAVE • Certainty that something did not happen He couldn`t have gone to the concert because he was ill
WOULD HAVE • Desire to do something in the past which in fact could not be done I would have gone to the party, but I was too busy
OUGHT TO/ SHOULD HAVE • Advice that wasn`t followed in the past He ought to/ should have listened to the producer • Criticism or regret after an event You ought to/ should have told me earlier
SHOULDN`T HAVE • Criticism or regret after an event You shouldn`t have refused the opportunity
NEEDN`T HAVE • An unnecessary past action You needn`t have raised your voice