My love don’t cost a thing.
She don’t love you (like I love you).
If you don’t understand him, an’ he don’t die young, He’ll prob’ly just ride away.
She don’t know.
He don’t deserve you anymore.
She don’t let nobody.
She don’t like the lights.
Your inner (or, indeed, outer) grammar pedant may have cringed at the recurring word in the lyrics and song titles above: don’t.
Doesn’t! that shrill little voice inside shouts, doesn’t!!
English-Language Thoughts 