Apostrophes

Annoying music escaped from Kayla's ear buds.

• Kayla's contains the correct apostrophe.

• No apostrophe is needed.

Buy your own pens! You cannot borrow ours!

• Ours does not need an apostrophe.

• Ours should have an apostrophe between the r & s: our's

• Ours should have an apostrophe after the s: ours'

The alarm clocks buzz startled Shane awake.

• Clocks does not need an apostrophe.

• Clocks should have an apostrophe between the k & s: clock's

Philip banged his knees' on the metal bar under his desk.

• Knees' contains the correct apostrophe.

• Knees should have an apostrophe before the s: knee's

• There's no apostrophe in knees.

Ciara's fingers moved quickly across the keyboard when she typed.

• Ciara's contains the correct apostrophe.

• The apostrophe should come after the s: Ciaras'