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Unit 6 Review

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  • He's become a bad student. I wonder what could (happen) to him.
    He's become a bad student. I wonder what could HAVE HAPPENED to him.
  • More things must (do) to solve global warming.
    More things must BE DONE to solve global warming.
  • He's too tired today. He must (stay) up all night.
    He's too tired today. He must HAVE STAYED up all night.
  • She is angry. He (keep) his promises.
    She is angry. He SHOULD HAVE KEPT his promises.
  • When I was 3, I (ride) a bike.
    When I was 3, I COULD RIDE a bike.
  • She looks exhausted. She must (jog) all morning.
    She looks exhausted. She must HAVE BEEN JOGGING all morning.
  • Where is your brother? He (do) his homework now.
    Where is your brother? He COULD BE DOING / MUST BE DOING his homework now.
  • The fresh meat must (keep) in the fridge.
    The fresh meat must BE KEPT in the fridge.
  • The problem of white rhinos' extinction should (solve) a long time ago.
    The problem of white rhinos' extinction should HAVE BEEN SOLVED a long time ago.
  • Tom has a test tomorrow. He's watching TV now but he should (study) for the test.
    Tom has a test tomorrow. He's watching TV now but he should BE STUDYING for the test.
  • You look awful. You (see) a doctor.
    You look awful. You SHOULD SEE a doctor.
  • This room should (clean) a long time ago.
    This room should HAVE BEEN CLEANED a long time ago.
  • We can't trust her. She must (watch) over carefully.
    We can't trust her. She must BE WATCHED over carefully.
  • You don't understand the question. You can't (listen) to the teacher.
    You don't understand the question. You can't HAVE BEEN LISTENING to the teacher.
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