- "To" and "too" are two different words (oh, I'm funny!!).
-to: toward a point, person, place, or thing, implied or understood
-too: in addition; also; furthermore; to an excessive extent or degree - "There," "Their," and "They're" are also different words.
-there: in or at that place - opposed to 'here': She is there now.
-their: a form of the possessive case of 'they' used as an attributive adjective, before a noun: their home
-they're: a contraction of "they are" - There's a whole list of others that I see mixed up almost as frequently.
-It's and its
-Are, hour and our
-Fare and fair
-accept and except
-all right and alright
-desert and dessert (when these were on a spelling list, my mom told me that you always want 2 desserts and there are 2 S's in dessert)
-Your and you're
-Then and than - An absolute lack of punctuation and paragraph use.
The thing is, I see most of these in emails and on forum boards. So I assume that some of the errors occur, because people are in a hurry. Sadly, I think the vasy majority of them occur, because people really don't know the difference, when to use commas or start a new paragraph anymore. Hopefully we'll soon adjust to the use of new technologies and figure out how to use the little conveniences in life, such as spell check, but still learn the basics of the English language.