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  • Stop! You _____ (not enter) this building! It’s forbidden. (short form)
    Stop! You mustn't enter this building! It’s forbidden.
  • I _____ (not finish) the task yet. I need 10 more minutes. (short form)
    I haven't finished the task yet. I need 10 more minutes.
  • We _____ (go) skiing to the Alps last year and it was fantastic!
    We went skiing to the Alps last year and it was fantastic!
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