Half of Britons struggle with the apostrophe

From Telegraph.co.uk:

According to a new survey nearly half the nation cannot use the possessive apostrophe and, most annoyingly, often replace "they're" with "their". The apostrophe has emerged in an independent poll of nearly 2,000 people as the punctuation mark that causes the most problems. Nearly half of UK adults tested were unable to use it properly. The most common mistake was not knowing how to punctuate a possessive plural. Nearly half (46 per cent) of those that sat the test thought that, in the context set, "people's choice" was wrong – whereas it is, of course, correct. Full story >>

Read the MailOnline's version of this story: Apostrophe Catastrophe.

To test yourself, identify which of the below are correctly or incorrectly punctuated:

1. These are Charlotte Brooks' books.

2. John is the people's choice.

3. Buster is Janes' dog.

4. How's it going today?

5. Johns' house is amazing.

6. All the teams in the league are going to vote, so it is all the team's choice.

7. You've got a lot of friends.

8. They're friends are all very nice.

9. It's a long way to Manchester.

10. Its ahead of it's time.

See answers

Apostrophe resources

• Guidelines for using apostrophes correctly
• The Apostrophe Protection Society
• Eats, Shoots & Leaves Punctuation Game