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  1. #1
    Joe333 is offline Member
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    Default Which one of these sentences is grammatically correct to use?

    Dear Sir/Madam,

    I wanna ask a question to my friend regarding his demeanor. I'm confuse which one of these sentence would be grammatically right to use in my letter.

    Why you have done so ? Why you have did so ?

    What's a diffrence between these two sentences and which one is grammatically correct pls tell.
    Last edited by Joe333; 18-Feb-2009 at 15:36.

  2. #2
    BobK's Avatar
    BobK is offline Harmless drudge
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    Default Re: Which one of these sentences is grammatically correct to use?

    Quote Originally Posted by razer View Post
    Dear Sir/Madam,

    I wanna ask a question to my friend regarding his demeanor. I'm confuse which one these sentence would be grammatically right to use in my letter.

    Why you have done so ? Why you have did so ?

    What's a diffrence between these two sentences and which one is grammatically correct pls tell.

    Neither; you need to invert the subject and the verb after a question word; so, if the present perfect was the right tense (which it's not) you would say 'Why have you...'.

    But I presume you're talking about a particular event; so the question would be 'Why did you do...?'

    However, "so" is the wrong word here. You'd say 'Why did you do that?' or 'Why did you act/behave like that?'

    If you're not referring to a particular event, you might want to use the present perfect continuous - 'Why have you been acting like that?', or you could specify a sort of behaviour: 'Why have you been acting strange [for the last couple of weeks]?

    b

  3. #3
    Charlie Bernstein is offline Senior Member
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    Default Re: Which one of these sentences is grammatically correct to use?

    Quote Originally Posted by razer View Post
    Dear Sir/Madam,

    I want to ask my friend a question xxx regarding his demeanor. I'm confuse about which one of these sentences would be grammatically right to use in my letter.

    Why you have done so ? Why you have did so ? Neither.

    What's the difference between these two sentences, and which one is grammatically correct? Please explain.
    This is correct: Why have you done so?

    1. To form a question, the right order is: Why have you.... - Not: Why you have....

    2. The rules:

    In perfect tenses, use done. Look what you have done. She has done her best. He didn't know what he had done.

    Use did only in the simple past tense. Look what you did. She did her best. He didn't know what he did.
    [I edit copy and have tutored college writing.]

  4. #4
    Charlie Bernstein is offline Senior Member
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    Default Re: Which one of these sentences is grammatically correct to use?

    Quote Originally Posted by BobK View Post
    However, "so" is the wrong word here. You'd say 'Why did you do that?' or 'Why did you act/behave like that?'
    Bob is right. I was only correcting your grammar. "Why have you done so?" is grammatically correct, but it is not conversational English.

    His suggestions are both grammatical and conversational. Because of that, they're better. If it were me, I would say: "Why did you do that?"

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