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    Message from suhasini posted on 17-11-2016 at 10:19:55 (D | E | F)
    I'm little confused about those two sentences,could you please help me?
    Thanks in advance for any help,

    For example:I'm waiting for ravi with another friend,chaya.
    I ask:where is ravi?

    Chaya guess:
    1)He must be on the buss.
    2)He can't be at home.

    My doubt is why we don't use mustn't instead of can't? and may I use mustn't in the second sentence?
    The other day I studied that the opposite of 'must' was 'can't' in that case.

    Edited by lucile83 on 17-11-2016 12:00

    Re: Sentence/help from hibou59, posted on 17-11-2016 at 15:24:36 (D | E)
    "He mustn't be at home." I think it is a possibility; but you are not sure about that.
    "He can't be at home" : it is an impossibility because he is somewhere else.

    Edited by lucile83 on 17-11-2016 22:26

    Re: Sentence/help from suhasini, posted on 17-11-2016 at 16:52:24 (D | E)
    Hello hibou59,

    Okay,you mean "He mustn't be at home means there is a chance he might be at home or mightn't". right?
    And "he can't be at home means It's sure he definitely not at home". right?

    Thank you very much for your help,I've got that now.

    Re: Sentence/help from zilazila, posted on 18-11-2016 at 12:38:40 (D | E)
    we use must when we feel sure that something is true.
    He must be on the bus. It is posibility.
    We use canít when we feel sure something is not true.
    He can't be at home. it is an impossibiliy.

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