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    Question a 40-year-old ? a 40-years-old


    a 40-year-old man, a 40-years-old man,

    24-hour service, 24-hours service,

    which is right? which is wrong? why it is right, why wrong?


    • Join Date: Apr 2009
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    Re: a 40-year-old ? a 40-years-old

    He's a 40-year-old man and it's a 24-hour service.

    When a compound adjective precedes a noun, and that compound adjective contains a countable noun, it should normally take the singular form:

    He's a 40-year-old man; he's 40 years old.
    It's a 24-hour service; it continues 24 hours a day.


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