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  1. #1
    hoangkha is offline Member
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    Default as old as or as young as?

    Hi, teachers!
    I have seen this sentence.
    John is sixteen years old, but Mary, his sister, is only eight.

    A. He is older than his sister two times.
    B. He is twice as old as his sister.
    C. His sister is twice as young as him.
    D. He is two twice as older as his sister.
    The key is B but I am wondering why C is incorrect, please.

  2. #2
    Rover_KE is offline Moderator
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    Default Re: as old as or as young as?

    It's a matter of usage. We just don't say 'twice as young'.

    'He is twice as old as his sister.'

    'She is half as old as her brother.'

    Rover

  3. #3
    hoangkha is offline Member
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    Default Re: as old as or as young as?

    Quote Originally Posted by Rover_KE View Post
    It's a matter of usage. We just don't say 'twice as young'.

    'He is twice as old as his sister.'

    'She is half as old as her brother.'

    Rover
    Thank Rover. But there is a question that
    - Is Mars twice as young as earth?

    http://wiki.answers.com/Q/Is_Mars_twice_as_young_as_earth

    Is it a wrong question?

  4. #4
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    bhaisahab is offline Moderator
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    Default Re: as old as or as young as?

    Quote Originally Posted by hoangkha View Post
    Thank Rover. But there is a question that
    - Is Mars twice as young as earth?

    Is Mars twice as young as earth

    Is it a wrong question?
    Yes, it is.

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