Possessive 's or is

     POSSESIVE 'S

1.   This is book. (Peter)
2. Let's go to the . (Smiths)
3. The room is upstairs. (children)
4. sister is twelve years old. (John)
5. and school is old. (Susan – Steve)
6. shoes are on the second floor. (men)
7. My car was not expensive. (parents)
8. CD player is new. (Charles)
9. This is the bike. (boy)
10. These are the pencils. (boys)

The meaning of   's  depends from the context. for example:

What´s she doing?

Here 's mean is, so the question is What is she doing? here is another example:

Is this Cathy's coffee?  
 it this case 's is expressing a possession, it's asking if the coffee is from Cathy.

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