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must vs mustn't

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  • We _______ run in the playground.
    mustn’t
  • When we play ball games, we ______ wait for our turn.
    must
  • We ______ sit still in the lessons.
    must
  • We ______ keep off the grass in the garden.
    must
  • We ______ line up in the corridor.
    must
  • We need to keep the classroom clean. We ______ spit or litter.
    mustn’t
  • We ______ climb the trees.
    mustn't
  • We ______ keep quiet in the classroom.
    must
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