Quote:
Originally Posted by Geoff45
Grammar 101 
1. Your book (ownership)
2. You're taking images (you're=you are)
3. It's not working (it's=it is)
4. The cat drinks its milk (ownership)
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For the 'ownership' example, you could have added that normally an apostrophe is in order - as in "John's book was open". The example you chose is the exception to this rule, - its - being a possessive pronoun.
Just sayin'