Oooooookaaaaaay. Most writers have their own individual pet peeves, but there are a few certain misspellings and errors that annoy EVERYONE. Here is a sentence that demonstrates a few of those certain errors.
"Their are two girls who enjoy taking they're mothers dog, who's collar is too tight, to the park with its owner whose always more tired than her children."
Rewrite it correctly. If you don't see anything wrong with it... a grammar book is in your near future.