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Should I use:

That is Bob's phone
He is Bob's student
Bob's car is red


That is Bobs phone
He is Bobs student
Bob's car is red

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closed as general reference by Armen Ծիրունյան, JSBձոգչ, coleopterist, MετάEd, Mark Beadles Nov 8 '12 at 19:25

This question is too basic; it can be definitively and permanently answered by a single link to a standard internet reference source designed specifically to find that type of information.If this question can be reworded to fit the rules in the help center, please edit the question.

up vote 5 down vote accepted

The current convention requires Bob's in all those examples.

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