- My brother's pencils were in my sister's pencil case.
- I have lots of teachers. All my teachers' lessons are fun.
- I live near a castle. That castle's tower is very tall.
- Saturn's rings are beautiful but Mars' atmosphere is thin.
- There were many girls. The girls' dresses were pretty.
- Mr. Wilson lives next door. Mr. Wilson's house is huge.
- A bird's wings help them fly. That bird's colour is blue.
- The car's bumpers were touching each other.
- The ten rivers' names were difficult to spell.
- That is John's brother's red car. John's car is blue.
Parent Tip: Review the logic above to help your child master the concept of apostrophe worksheet with answer key.