then - a word often used to make a statement conditional by describing the consequence of an action. Often times used in conjunction with the word “if”.
than - a word most often used to create comparisons between two or more different objects.
These are not interchangeable.
Dear internet, your making me stupider by reading you.
I hate you.
-Eric
your - the possessive form of you.
you’re - a contraction of the words you and are.
The internet doesn’t own a ‘making me stupider by reading you.’ Come on, Eric.
I love you.
-Brian