"Ain't" is considered a nonstandard contraction. But it is also part of some people's natural dialect. Sticking to formal forms is better for writing. And, I wouldn't say "ain't" around anyone you want to impress, since it is considered by many to be a contraction that only uneducated people use. "Ain't" is a contraction that can replace the negative contractions in any of the following phrases. So the affirmative would be the contractions without "not" in them. Aren't I? Ain't I? Am I? I'm not... I ain't... I'm.. Aren't you? Ain't you? Are you? You aren't. You ain't. You're... Isn't he, she, it? Ain't he, she, it? Is he, she, it? He, she, it isn't... He, she, it ain't... He's, she's, it's Aren't we? Ain't we? Are we? We aren't.... We ain't... We're... Aren't they? Ain't they? They aren't. They ain't... Are they? They're...

My English teacher said that it's not something that we will learn because it's informal. Generally speaking, it is a colloquial contraction for "am not", "is not", "are not", "has not", and "have not" . But it is not considered proper English and is better avoided by those learning the language. Of course, this is just my opinion. Others may vary. Example: I ain't going to do my homework.

Haha. Thank you for the information!

I would definitely try not to ever use the word "ain't" it is so colloquial that a lot of people who use the word "ain't" are thought to be ignorant, dumb, undereducated (in my opinion). It's not a commonly accepted slang word. We have a saying, "Ain't ain't I word and I ain't gonna use it" haha :P

"Ain't" is a slangy, somewhat lowbrow way to say "isn't." Generally, it is used when you want to sound very informal, though some people use it in everyday speech. However, it is not considered "proper" English. It has no affirmative form of it's own, but I would say the closest thing would be "is."