Contractions

Contractions , while not permissible in dignified utterance or in formal writing, are in accordance with the conversational employment of the language. The following is the list:

I'm notyou're nothe's notwe're notthey're not  are used in the declarative form, and isn't he  (she, or it ), aren't you (wethey ) in the interrogative. In the declarative form, You're nothe's not, etc., are preferable to you aren'the isn't, etc. Am I not  is not contracted, ain't  being regarded as objectionable for am I not, and as a vulgarism for isn't. [See ain't.]

“He (she or it) don't ” for He (she or it) doesn't  is always incorrect. I don'tyou don'the doesn'twe don'tyou don'tthey don't, are in accordance with the conversational employment of the language.

Mayn't I  (or may I not ) is correct in the interrogative form; you can't  (or you can not ) in the declarative form. In this connection note that may  is used when asking and granting permission, and that can, which ordinarily expresses ability, is used in the declarative form when denying permission; thus: “May  I go.” “No, you can not.”

The contractions shan't  and won't  are in accordance with conversational usage.