I can't take it anymore. At first it was only occasionally. Now it seems that every time I turn on the TV someone else is doing it. Doesn't our school system teach English anymore? I am referring, specifically, to pronouns. At least three times today I have heard expressions like "of, course, that's just between you and I" and "the party was for Susan and I".
I'll say it just one more time.
When used as the subject, use "I" instead of "me" as in "Andrew and I went to the movie". When used as an object either of a verb or a preposition, use "me" as in "the party was thrown for Susan and me." The easiest way to tell which to use is to replace the compound (Andrew and me) with the non-compound (me) and see if it still sounds right. Take the following sentence:
The party was thrown for Susan and I.
Which of the following two sounds right?
The party was thrown for I.
The party was thrown for me.
Simple, isn't it? Most of the confusion, I suspect, is from formal English phrases such as the following:
My brother is taller than I.
In formal English, I is gramatically correct because the sentence ends with an implied am as in
My brother is taller than I (am).
In conversational English, ending the sentence with me is considered proper. However, people who want to sound educated (most TV writers, I suspect) feel that always using the I form sounds classier. In fact, it is most often incorrect.
I am far from an expert in grammar but even high school graduates should have a basic grasp of the simpler rules.