• Must - Have to - Shall - May
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  • You .... (must/mustn't) be late for school.
    You mustn't be late for school. 
  • You .... (must/shall) be quiet in the library.
    You must be quiet in the library.
  • ..... (Must/May) I have a glass of water, please?
    May I have a glass of water, please?
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