• Modal verbs
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  • Today is a public holiday, so Helen (must not go / doesn't have to go) to work.
    Today is a public holiday, so Helen doesn't have to go to work.
  • You (can't use / don't have to use) a calculator to answer the question '2+2=?'
    You don't have to use a calculator to answer the question '2+2=?'
  • The students (can't use / don't have to use) their phones in the exam.
    The students can't use their phones in the exam.
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