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Modal verbs of possibility and certainty

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  • "Whose phone is this?" – "I don't know for sure, but it ____ be Morgan's"
    may / might / could
  • She _____ speak 6 languages fluently.
    can
  • ____ I speak to the manager? (permission/polite request)
    can / may
  • She ____ be very pleased with herself. She got the best grades. (affirmative deduction)
    must
  • I'm not sure, but it _____ rain later on. (possibly)
    may / might/ could
  • _____ I go to the bathroom please? (permission)
    may / can/could
  • I ____ go to the dentist soon. (obligation)
    must/have to
  • You ___ go to the concert if you want to. (permission)
    can / may
  • It ____ be scary to swim with sharks! (deduction)
    must
  • You ____ be late again, or you will be fired!
    can't/ mustn't
  • ___ you tell me which day your birthday is? I'm sorry that I ___ remember!
    Can / can't
  • I ____ finish the project by tomorrow, don't worry. (ability)
    can/am able to
  • I _____ go to the concert, but I don't know yet.
    might / may
  • You __________ talk during the movie. (Prohibition)
    must not / mustn't
  • You ____ forget your sunscreen, it's going to be hot!
    shouldn't/ ought not to /had better not / mustn't
  • You've been awake for 3 days, you ____ be very tired! Do you think you____ sleep tonight? 
    must / can
  • I ________ swim when I was a child, but I took many lessons– so now I _____!
    couldn't / can
  • We ____ go to Italy this summer, but we're not sure. (possibly)
    may/might/ could
  • ______ you speak French? Only a few words, but my Russian is pretty good! (ability)
    can
  • I'm afraid I ____ make plans with you tomorrow, I have to go to work.
    can't
  • You ____ drink the tap water everywhere– it's not safe!
    must not / mustn't
  • He ____ be telling the truth, but I don't believe him. (possible)
    may / might
  • I ___ work as a taxi driver– I don't know how to drive! (impossible)
    can't
  • I ____ be able to help you, but I'm not sure yet.
    might / may/ could
  • I ___ pay my rent this month because I'm poor. Luckily my friend ___ lend me some money.  (ability)
    can't / can
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