This English Language quiz is called 'Apostrophes to Mark Possession' and it has been written by teachers to help you if you are studying the subject at elementary school. Playing educational quizzes is an enjoyable way to learn if you are in the 3rd, 4th or 5th grade - aged 8 to 11.
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As well as showing omission, apostrophes are also used to show possession: it shows who owns what. This use of the apostrophe is not as straightforward as showing omission and can cause a lot of headaches.