YOU'RE = "you are"
e.g.- You're going to click on the text ads to the right to earn Calvin some money.
YOUR = belonging to the person you are speaking to
e.g.- Your clicks on the text ads to the right will earn Calvin some money.
THEIR = belonging to the people previously mentioned
e.g.- Walgreens has great deals. Their Red Vines are always on sale.
THEY'RE = "they are"
e.g.- They're dumb.
THERE = in, at, or to that place (in specific)
e.g.- The line starts back there.
Yours Truly,
Ross Geller
