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  1. wotcha's Avatar
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      • Native Language:
      • Korean
      • Home Country:
      • South Korea
      • Current Location:
      • South Korea

    • Join Date: Jun 2010
    • Posts: 735
    #1

    It is certain/sure that....// I'm sure/ certain that....

    1. It is certain that he will succeed.

    2. I'm certain that he will succeed.

    3. It is sure that he will succeed.

    4. I'm sure that he will succeed.


    I think sentence 3 is not grammatical and sounds awkward?

  2. MikeNewYork's Avatar
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      • Native Language:
      • American English
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      • United States
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      • United States

    • Join Date: Nov 2002
    • Posts: 24,983
    #2

    Re: It is certain/sure that....// I'm sure/ certain that....

    Quote Originally Posted by wotcha View Post
    1. It is certain that he will succeed.

    2. I'm certain that he will succeed.

    3. It is sure that he will succeed.

    4. I'm sure that he will succeed.


    I think sentence 3 is not grammatical and sounds awkward?
    I agree that it is unnatural. Although "sure" and "certain" are synonyms, "sure" is more subjective than "certain". That is why it works better when it applies to a person's belief or opinion (I am sure) then when it takes on a broader meaning (It is sure).
    See usage note here: sure - definition of sure by the Free Online Dictionary, Thesaurus and Encyclopedia.

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