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    • Member Info
      • Native Language:
      • Persian
      • Home Country:
      • Iran
      • Current Location:
      • Iran

    • Join Date: Jun 2007
    • Posts: 19
    #1

    's

    in "teacher's book" 's is used but it isn't used in "student book"
    or other examples like "john's book" "cigarette ash"
    why sometimes 's is used and sometimes it isn't ?


    • Join Date: Oct 2006
    • Posts: 19,434
    #2

    Re: 's

    Sometimes it is a possessive [ teacher's book = the book belonging to the teacher; John's book - the book belonging to John ]; sometimes is is an adjective [cigarette ash = ash from a cigarette; student book = book for use by students].

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