Things to Remember:
You're and Your are not the same words!
Apostrophes do NOT make plural nouns!
Their, They're and There are completely different words!
You will NEVER say/write "could of", "should of" or "would of".
The correct form is:
could have should have would have
The past tense of bring is brought! (Brung is NOT a word!)
To, Too and Two are also completely different words
Its is the possessive form of it, It's is the contraction of It is.