Haven't you worked it out yet?
Your = The possessive form of you.
You're = Contraction of you are.
(
butchbint,
Thu 27 Jun 2002, 8:05,
archived)
you're a DutchBird
and you have a better grasp of the language than divvy Jeff.
(
fastcar,
Thu 27 Jun 2002, 8:16,
archived)