And I or And Me? Easy Way to Tell...

I've seen two or three stories lately that don't have this correct, and figured it wouldn't hurt to post it:

The object of a preposition (like to or for) should be me and not I. Nearly all writers have no trouble with that.

But when a second object is added -- that's not a problem for Bobbie or me or the letter was addressed to Robin and me, a number of people incorrectly use I instead of me.

If you have any doubts -- most sentences, after all, are more complex than those two and may not be as easy to sort out -- an easy way to tell is to read the sentence to yourself omitting the other subject -- in the cases above, a problem for me and addressed to me. If you'd typed for Bobbie and I, re-reading it as for I should convince you that you have it wrong.

Hope some of you may find that helpful.

Eric

(It's futile, but while I'm here and discussing pronouns, one more time around for its:

There's no apostrophe in the possessive form its, just as there isn't one in his, hers, yours or theirs. (As someone pointed out last time I wrote this, that's not a completely fair comparison, but her, your and their don't have apostrophes either (g).)

It's is a contraction for it is. That's the only time an apostrophe-s should appear with it.

Its', which has shown up occasionally here, isn't a word. S-apostrophe is a possessive plural, and it is always singular.)