Hey
Skoorb,
Don't listen to the ones complaining about your threads like this, I like 'em.

They're better than most of the others, this gives something actually useful and fun to discuss/debate, and entertaining when you see how many people don't know jack about spieling and an gremmer.
Seriously though, il n y a
rien de compliqué concernant la langue anglaise!
You could speak and write without using any abbreviations or contractions. You would just speak like a robot (or Vulcan if you're a trekkie)!
It's really quite simple...
It is = It's, as many have pointed out, and can also be used for it has. I honestly don't see the complicatinos with that.
Let's take an examplatory sentence:
Billy Joe liked his guitar's colour
Well, we could change that to
He liked its colour. There's no apostrophe because if there
was one, it would mean
it is, which obviously would make no sense at all. I'm no english expert (it IS my mother tongue), and I'm no english professor, but it's not hard to figure out simple rules like this, which are taught in the early years of school.
You, You Are - You're, it - it's, they - they're, etc - All you really need to remember is what the apostrophe does - it substitutes a word like "is", "has" or "are", etc. So any time you have trouble using the
it's and
you'res, think of that. Break it down and ask yourself if it would make sense!
However, there are often times when the apostrophe does
not mean IS or HAS or ARE. For example, if you're writing a sentence, and you want to say the guitar of billy is blue, you're not going to write
Billys guitar is blue cause you think "there is no 'is' attached to billy". You're right, there is no
is, but there's still an apostrophe! I don't know the technical crapola for that, but
it's just the way it is!
Adul: That made absolutely no sense!!
OK, I think some people explained this better than I did. But I don't think I made many or any mistakes.
-RSI