1. I can't go with you to Colin's house.
2. Let's go to the Bears game on the weekend.
3. I don't think my dad's hat will fit me.
4. The girls' bathing suits need to be put in the dryer.
5. I'm going to head down to Clarks department store later.
6. Where's the book I was reading? I'm really enjoying it?
7. I put the dogs' bones in the lower cupboard.
8. I put the dog's bones in the lower cupboard.
9. I'm going to my friend's house to work on homework.
10. Jan's clothes are always in style.
11. Buy your notebooks here and you'll save money.
12. The cat's whiskers are covered in milk.
Parent Tip: Review the logic above to help your child master the concept of apostrophe worksheet with answer key.