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Thread: the second IS

  1. #1
    Sepmre is offline Member
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    Lightbulb the second IS

    Hi,

    I think that the second "is" in the below sentence must be omitted, is it grammatically correct?

    Not until point D is reached is the total enthalpy increase sufficient to raise all the liquid to the saturation temperature.


    Thanks

  2. #2
    Raymott's Avatar
    Raymott is offline VIP Member
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    Default Re: the second IS

    Quote Originally Posted by Sepmre View Post
    Hi,

    I think that the second "is" in the below sentence must be omitted. Is it grammatically correct?

    Not until point D is reached is the total enthalpy increase sufficient to raise all the liquid to the saturation temperature.
    It's correct. It means, "It is only when point D is reached that the total enthalpy increase is sufficient ..." (Note: my sentence has 3 'is' because of the dummy 'It'.)

  3. #3
    Tdol is offline Editor, UsingEnglish.com
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    Default Re: the second IS

    Quote Originally Posted by Sepmre View Post
    I think that the second "is" in the below sentence must be omitted, is it grammatically correct?
    It's wrong to omit it IMO.

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