However, for first person pronoun, I, there is no contraction with the verb be + not. (“Amn't” is not a word in English.) Therefore, in casual speech and writing, English speakers use aren't, instead, and except in formal situations, this is considered entirely grammatical.

Why is AMN T not a word?

Unlike those other contractions, “amn't” is not common today. It's heard mostly in Scottish and Irish English, according to Merriam-Webster online. In the United States it's “nonstandard,” according to the Oxford English Dictionary. The reason “amn't” is not widely used is that it's ungainly and awkward to pronounce.

Is there a contraction for am not?

Ain't is a contraction that can mean am not, are not, and is not. ... Ain't apparently begins as amn't, a contraction for am not, which you can still hear in Ireland and Scotland today. Ain't is recorded in the early 1700s, with amn't found a century before.