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    #1

    Sentence

    He must have left by tomorrow.
    Is grammar of the sentence right?

    You are/were the best person I've ever known.
    Both are and were are right in this case?

    Please.
    Last edited by puzzle; 17-Mar-2009 at 14:00.


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    #2

    Re: Sentence

    Quote Originally Posted by puzzle View Post
    He must have left by tomorrow.
    Is grammar of the sentence right?

    You are/were the best person I've ever known.
    Both are and were are right in this case?

    Please.
    He should have left by tomorrow.

    You are the best person I've ever known.

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    #3

    Re: Sentence

    He must have left by tomorrow.

    The sentence's grammar is totally wrong? Please.


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    #4

    Re: Sentence

    Quote Originally Posted by puzzle View Post
    He must have left by tomorrow.

    The sentence's grammar is totally wrong? Please.
    'Must' is not used in the meaning of supposition for future reference. That's why I replaced it with 'should' which is rather close in the degree of certainty. There could be other options:
    He will probably leave / have left by tomorrow.
    He is sure / certain to ...

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    #5

    Re: Sentence

    Clark,Thank you.

    Is there other opinions?


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    #6

    Re: Sentence

    Of course, if you want to express obligation you can use 'must' but in that case you'll have to use a simple infinitive instead of the perfect one.

    He must leave by tomorrow. (= I order that he should leave)

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    #7

    Re: Sentence

    What about this:

    I could have been working late tomorrow.

    Is it right?


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    #8

    Re: Sentence

    Quote Originally Posted by puzzle View Post
    What about this:

    I could have been working late tomorrow.

    Is it right?
    No.
    The perfect continuous infinitive 'have been working' indicates a prior action. So there is a contradiction between the idea of priority expressed by it and the adverb 'tomorrow' which refers the action to the future.

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