I'd like to know, whether the following sentences are correct.

1. He don't know about that book.
2. He doesn't know about that book.
3. He don't have that book.
4. He doesn't have that book.
5. I doesn't have it.
6. He don't have it.

Kindly let me know the answer.

Thanks and Regards,
Shivakumar. S
Hello, Shiv, and welcome to the forums. Emotion: smile

Did you post this same question as a "Guest"? I answered it here: [url="http://www.EnglishForward.com/ShowPost.aspx?PostID=38219 "]Grammar[/url]

Site Hint: Check out our list of pronunciation videos.
speaking of don't and doesn't, I still hear people (americans) say things like he/she don't...Also, i hear a song with a sentence like: it don't mean a thing....Is that because it's easier to sing without an extra sillable? or whatever reason that is I need to know why. thanks.
The absolute correct version is always doesn't.

However colloquial English speakers will sometimes use don't, depending on their background and the area in which they live. It is considered a rather uneducated way of speaking, but is perfectly normal in some communities.
I see!
Thank you.
Teachers: We supply a list of EFL job vacancies