Quote Originally Posted by fcman
i knew you were gonna say that, screw this and screw you!
The apostrophe has three uses:

1) to form possessives of nouns
2) to show the omission of letters
3) to indicate certain plurals of lowercase letters.

Apostrophes are NOT used for possessive pronouns or for noun plurals, including acronyms.

Showing omission of letters

Apostrophes are used in contractions. A contraction is a word (or set of numbers) in which one or more letters (or numbers) have been omitted. The apostrophe shows this omission. Contractions are common in speaking and in informal writing. To use an apostrophe to create a contraction, place an apostrophe where the omitted letter(s) would go. Here are some examples:

don't = do not

that's = that is

I'm = I am

he'll = he will

who's = who is

shouldn't = should not

didn't = did not

could've= could have (NOT "could of"!)

'60 = 1960