WHEN TO USE AN APOSTROPHE

Here's a quick guide to the use of apostrophes. Remember:
- USE IT IN CONTRACTIONS.
don't / can't / it's / we're / you'd / etc...
- USE IT WITH THE POSSESSIVE GENITIVE.
Peter's car / Mary's umbrella / the cat's feet / etc...
- BUT NEVER USE IT TO MAKE PLURALS OF NOUNS.
books / houses / tomatoes / DVDs / CDs / 80s / etc...