Sunday, June 9, 2013

negation - "...mustn't have done..": can it mean reproach for a past action or prohibition of a future action?


  1. Can "You mustn't have done that" have a similar meaning to "You shouldn't have done that" / "You were not supposed to do it (but you did)"?
    (not logical probability but obligation)


  2. Since we have the imperatives like "Have done with that!", wouldn't it be possible to use must to express prohibition of a future action: "You mustn't have done that (by the time the bus reaches here tomorrow)"?


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