Expressing Obligation

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1. MUST, HAVE TO, SHOULD 2.  … to describe what is necessary, a rule, or something we do because other people tell us to. For example: “ We have to buy a ticket to…
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  • 1. MUST, HAVE TO, SHOULD
  • 2.  … to describe what is necessary, a rule, or something we do because other people tell us to. For example: “ We have to buy a ticket to see the castle” “She has to wear a uniform at work”
  • 3.  The negative form, DON’T or DOESN’T HAVE TO is used to describe something UNNECESSARY. For example: “I don’t have to work tomorrow.There’s a holiday”
  • 4.  … to describe something we personally think is necessary and important to do. For example: “You must be more careful!” “Sorry, I must go now”
  • 5.  …when an action is against the rules or prohibited.You can often use can’t or not allowed to instead. For example: “You mustn’t use a pencil to do the exam” (it is not allowed)
  • 6.  … to say what we think is right or correct, or is a good idea in your opinion.This is not as strong as must/ have to.  … to give advice. For example: “You should pay more attention” “You shouldn’t talk so much”
  • 7.  MUST/ MUSTN’T  HAVE TO/ HAS TO  DON’T HAVE TO/ DOESN’T HAVE TO  SHOULD/ SHOULDN’T They are all followed by an INFINITIVE VERB.
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