It's is what it is.

There were the times when I taught English. Reading, writing, comprehension, verbal expression were all part of the syllabus. Grammar, mechanics, parallel structure, tense, voice, parts of speech, I taught them all. I taught all right, but who learned what, I can't say. All I want to do now is teach as many people as possible one simple thing-----the proper use of its and it's. Not to mention that there is NO such construction as its' and I hate to even type it here. The apostrophe never comes after the s. The possessive is its and the contraction it's means it is. Simple, right? But it's a rule which has lost its meaning. My life has lost its meaning and it's a sad realization. It's hard to say it's true.