YOU'RE= YOU ARE. Ex:
You're an idiot for not knowing this.
YOUR= POSSESSIVE Ex: You need to work on your
grammar.
THERE = LIKE A PLACE. Ex: Your grammar book is right over
there.
THEY'RE= THEY ARE. Ex: They're really
dim-witted for not using the correct form of these words.
THEIR = POSSESSIVE. Ex: The people who don't know this,
don't use their brains.
Now that this is all cleared up, I'd like to stop seeing
these errors all over the place.
Thanks.