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PERDECT MODALS

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  • I AM SURE she was at home.
    She must have been at home. (You’re certain about a past fact → must have.)
  • WE HAD THE OPPORTUNITY to see the movie, but we didn’t.
    We could have seen the movie. (Missed opportunity → could have.)
  • IT WAS THE RIGHT THING to help him, but she didn’t.
    She should have helped him. (Advice → should have.)
  • IT WAS WRONG to yell at him.
    You should have stayed calm. (Judgment → should have.)
  • I HAVE NO DOUBT he worked all night.
    He must have worked all night. (You’re certain → must have.)
  • I didn’t bring an umbrella, it rained and I got wet.
    If I had brought one, I wouldn’t have gotten wet. (Hypothetical past — I got wet because I didn’t bring an umbrella.)
  • I REGRET not calling you sooner.
    I should have called you sooner. (Regret → should have.)
  • IT'S IMPOSSIBLE that he saw me.
    He can’t have seen me. (Past impossibility → can’t have.)
  • I THINK they forgot about the meeting.
    They might have forgotten about the meeting. (Not sure → might have for possibility.)
  • HE HAD THE OPPORTUNITY  to arrive on time, but he didn’t.
    He could have arrived on time. (Missed opportunity → could have.)
  • I AM SURE she forgot her keys.
    She must have forgotten her keys. (You’re certain → must have.)
  • I’M POSITIVE they were tired after the trip.
    They must have been tired after the trip. (You’re certain → must have.)
  • PERHAPS she missed the bus.
    She might have missed the bus. (Possible but not certain → might have.)
  • IF I HAD KNOWN about the party, I would have gone.
    I would have gone to the party if I had known. (Hypothetical → would have.)
  • I’M CERTAIN they left early.
    They must have left early. (Sure about the past → must have.)
  • I EXPECTED you to finish earlier.
    You should have finished earlier. (Expectation → should have.)
  • SHE HAD THE CHANCE to win, but she didn’t.
    She could have won. (Missed opportunity → could have.)
  • IT WAS UNFAIR to ignore her question.
    You should have answered her question. (Judgment → should have.)
  • She didn’t study for the test, so she failed.
    If she had studied, she would have passed easily. (Hypothetical past — she failed because she didn’t study.)
  • IF SHE HAD ASKED for help, I would have helped her.
    I would have helped her if she had asked. (Hypothetical → would have.)
  • He didn’t ask for help and made mistakes.
    If he had asked, he would have avoided errors. (Hypothetical past — he made mistakes because he didn’t ask for help.)
  • THERE WAS A POSSIBILITY they’d finish earlier, but they didn’t.
    They could have finished earlier. (Missed opportunity → could have.)
  • THERE’S NO WAY he stayed until the end.
    He must have left early. (You’re certain → must have.)
  • HE WAS ABLE to help you, but he didn’t.
    He could have helped you. (Missed opportunity → could have.)
  • They didn’t invite me to the party, so I didn’t attend.
    If they had invited me, I would have come to the party. (Hypothetical past — I didn’t come because I wasn’t invited.)
  • I KNOW FOR A FACT she studied for the test.
    She must have studied for the test. (You’re certain → must have.)
  • IT WAS THE RIGHT THING to tell the truth, but you didn’t.
    You should have told the truth. (Advice → should have.)
  • I REGRET not studying harder.
    I should have studied harder. (Regret → should have.)
  • The weather was terrible yesterday, so I didn’t go out.
    If the weather had been better, I would have gone for a walk. (Hypothetical past situation — I didn’t go because the weather was bad.)
  • I EXPECTED them to arrive by now.
    They should have arrived by now. (Expectation → should have.)
  • I DOUBT he understood the question.
    He might not have understood the question. (Uncertain negative → might not have.)