We (not us) southerners have issues with pronouns, in case y'all haven't noticed. Most of us (not we) might have begun that sentence with "Us", but that would have been incorrect. Now I don't claim to be no expert, but I do know a thing or two about grammar. See that double negative? That is perfectly acceptable in southern speech, because it's (not its) a known fact that we (not us) southerners like to emphasize a point, even if it is grammatically incorrect.
Seems to me (not I) that by the time we (not us) get to grammar school, our speech patterns have already taken root. We say things like "me and bubba went fishing" and before we can finish telling y'all how big the fish was, the teacher rudely interrupts and says "bubba and I". What the heck - she wasn't even there! So we go again, and she interrupts again, this time telling us that we should always say "bubba and I" and not never "me and bubba". However, she neglects to tell us that sometimes it is correct to say "me and bubba" or, better yet, "bubba and me". That's probably because she's a southerner herself and takes great pride in having graduated from an institute of higher learning, which must be reflected in her refined speech and does not recognize the use of "bubba and me" as correct even when it is. [end rant]
That's my best guess anyway as to why there is so much confusion over the correct use of pronouns. So I'm going to try to set the record straight (or skrate) once and for all. I will attempt to simplify it without the use of words like "subjective" and "objective" because, frankly, it's not about diagramming sentences. It's about "you" and "me" -which is, by the way, grammatically correct.
I = you, he, she, it, we, they (anything on this line can be substituted for or used with any other and still make sense)
me = you, him, her, it, us, them (same here)
When trying to decide whether to say "bubba and I" or "bubba and me", substitute "we" or "us".
We (bubba and I) went fishing. Mama whupped us (bubba and me) for skipping school. She told us (me and bubba) don't never do that again!
That's all there is to it, folks. Any questions (or kwerstions)?
OK then, moving right along.
Apostrophe's also seem to crop up all over the place where they aren't needed. (Hint: The first one is not needed, but the second one is.) Again, I'll make it simple.
To make it plural, add s; to show possession, add 's. To make a contraction, use ' to replace the dropped letter or letters (not letter's).
F'rinstance, y'all is a contraction of you all, therefore the ' should be placed between y and a.
That's it, y'all.
Do what you will with punctuation.