USES concerning past events Modal Perfects ability possibility certainty logical conclusion probability guessing regret willingness examples could have + participle They could have bought that house, but they didn't... they're so skinflint! The experiment...
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USES concerning past events Modal Perfects ability possibility certainty logical conclusion probability guessing regret willingness examples could have + participle They could have bought that house, but they didn't... they're so skinflint! The experiment could have been successful; but we'll never know, they didn't even try. couldn't have + participle He couldn't have travelled abroad. He has to take care of his mother. can't have + participle He can't have travelled abroad. He has to take care of his mother. must have + participle You visited Rome. It must have been great! may / might + participle The experiment may / might have been successful; but we'll never know, they didn't even try. should / ought to + participle You should / ought to have visited your grandmother when I told you; now it's too late for her. shouldn't have + participle Peter shouldn't have phoned home so early in the morning; they were sleeping and they got scared! would I would have called you or sent you a sms
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