I am Vs I'm Vs Am. 1. "I'm" is the contracted form of "I am". "I'm" is the most common form to use when speaking as it saves time and doesn't require two syllables to pronounce. You can also use it in informal writing. E.g. (i). I'm a man. (ii). I'm on my way to see you. 2(a). "I am" is used in formal writing especially formal letters. E.g. (i)I am writing this letter to inform you... (ii)I am writing to inform you of my proposal... (b). You can also use "I am" to emphasize a noun in a sentence

Ehyeh Asher Ehyeh (I Am that I Am) Affirmation