Easy Grammar Rules

Here are some tips that you can use to arm yourself against the Grammar Nazis that lurk in the shadows of the Interwebs, just waiting for you to screw up.  I'm one of them.  THIS IS NOT HARD, PEOPLE.

Apostrophes

1. Apostrophes never, ever, ever mean that something is plural.
   
• Wrong: The FARK threads are full of Grammar Nazi's.
• Right: The FARK threads are full of Grammar Nazis.
  
  Seriously, an apostrophe is NEVER used to indicate the plural.  Never.  Not once.
  
  
2. Apostrophes are never, ever, ever used to indicate possession on a pronoun.
• Wrong: The page on grammar rules is her's.
• Right: The page on grammar rules is hers.
  
  I know apostrophes indicate possession on nouns, like "Jack's car" or "Maryland's crippling lack of qualified drivers."  But pronouns have their own special forms for possession, and they never involve apostrophes.  Hint: "It" is a pronoun.
  
  
3.  It's is ALWAYS a contraction.  Every time.  It's always means "It is."
• Since "it" is a pronoun, the possessive form will always be its, just like his or theirs. 
• That means it's always means "it is."