WRONG:

HE DON'T

RIGHT:

HE DOESN'T

"Don't" is used only in the first person, singular and plural and in the third person plural. "I don't like avacado ice cream" is correct, and so is "they don't have their passports yet " and "they don't have the sense to come in out of the rain"; but "he don't have no money," though common in certain dialects, is nonstandard on two counts: it should be "he doesn't" and "any money." The same is true of other forms: "she don't" and "it don't" should be "she doesn't" and "it doesn't."

List of errors