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Modals of probability/possibility (Deduction)

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  • What modal structure do we use to say that something is OBLIGATORY?
    Must (for internal obligations) Have to (for external obligations - rules etc.)
  • Anna has a huge library in her house. She ________ love books.
    must
  • I think there ______ be a mistake in your tax return. You should check it
    might/may/could
  • Explain the difference between 'MUSTN'T' and 'DON'T HAVE TO'.
    MUSTN'T means something is PROHIBITED or it is NOT ALLOWED. Don't have to means there is NO OBLIGATION.
  • That woman drives a very expensive car. She ________ (have) a lot of money.
    must
  • David really likes that restaurant. He _______ be there now.
    might/may/could
  • It _____ be very hard to know which modal verbs to use sometimes.
    can
  • He's usually a very nice man, but he ______ be impatient sometimes.
    can
  • What modal verb do we use when we are SURE that something is true (even though we don't actually know)?
    Must
  • I really ______ get more exercise.
    MUST
  • If you haven't eaten all day, you ________ be hungry.
    must
  • You have walked for ten hours. You ______ be exhausted.
    must
  • It's not obligatory to take a tie. You _______ wear one. MUSTN'T/DON'T HAVE TO
    DON'T HAVE TO
  • What modal structure do we use to RECOMMEND or to say that something is A GOOD IDEA?
    Should
  • What modal verb do we use when we are SURE that something ISN'T true (even though we don't actually know)?
    can't
  • He ______ be his son, they look completely different.
    can't be
  • There's a bit of traffic, so I ______ not arrive in time.
    might/may/could
  • It ________ be hot outside. That man in the street is wearing a coat.
    can't
  • Keiko always does really well on exams. She ________ study a lot.
    must
  • You ____________ chat to other students while the teacher is speaking. MUSTN'T/DON'T HAVE TO
    MUSTN'T
  • David __________ be happy. His girlfriend has just broken up with him.
    can't
  • Paul is being very strange to me. I think he ______ be angry with me.
    might/may/could
  • Ireland is a beautiful country, but the weather _______ be very bad sometimes.
    can
  • What modal structure do we use to say that something is PROHIBITED?
    Mustn't/Can't
  • What modal verbs do we use when we are think something MIGHT be true (even though we don't actually know)? There are three.
    might/may/could
  • What modal structure do we use to say that something is NOT OBLIGATORY?
    don't have to
  • The museum is free. You ________________ pay to get in. MUSTN'T/DON'T HAVE TO
    don't have to
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