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  1. #11
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    keannu is offline Key Member
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    Default Re: That boy __________ be Jason

    Quote Originally Posted by Raymott View Post
    "Must not" does not fit that example. The only correct answer (from those given) is 2 (can't). "Couldn't" would also work.

    In any case, I don't think the opinions are necessarily different. The first two answers are discussing your opening statement about obligation and certainty and the rest, (which was where your questions are.)
    bhaishab's answer addresses the test question (as does mine).

    PS: Just read Bob's response. Yes, I suppose you could torture "must not" into place. But the correct answer to questions like this is usually held to the be the most obvious, not just any minimally possible answer. You could also fit "can" and "might" if you had to:
    "That boy might be Jason. Jason has gone to Japan. But he could be back by now"
    I'm really sorry I couldn't understand what Bob said about the difference between "must not be" and "can't be", I'm really sorry I need easier interpretation.

  2. #12
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    Default Re: That boy __________ be Jason

    Quote Originally Posted by keannu View Post
    I'm really sorry I need easier interpretation.
    The easiest answer is that 'must' can used to suggest logical certainty of an affirmative situation , and 'can't' for logical certainty of a negative situation.

    'Must' can alo be used to impose an obligation to do something, 'mustn't' to impose an obligation to not-do something, and 'don't have to/needn't' to state absence of obligation.

    'Must not' is rarely used to suggest logical certainty of a negative situation, but it can be, 'Mustn't' is used in this way so rarely, and by so few speakers, that for practical purposes we can say that it is not so used.

  3. #13
    keannu's Avatar
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    Default Re: That boy __________ be Jason

    Quote Originally Posted by 5jj View Post
    The easiest answer is that 'must' can used to suggest logical certainty of an affirmative situation , and 'can't' for logical certainty of a negative situation.

    'Must' can alo be used to impose an obligation to do something, 'mustn't' to impose an obligation to not-do something, and 'don't have to/needn't' to state absence of obligation.

    'Must not' is rarely used to suggest logical certainty of a negative situation, but it can be, 'Mustn't' is used in this way so rarely, and by so few speakers, that for practical purposes we can say that it is not so used.
    All I can say is "Perfetto*10000" * "Awesome*1000"

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