I'm is a contracted form of I am, functioning as a first-person singular present-tense verb. It typically surfaces in speech as a short, unstressed syllable sequence that links to the next word, often with a reduced vowel in I and a light, quick /m/ closure. In casual speech it blends smoothly, almost like one syllable, so you’ll hear it as /aɪm/ with potential vowel reduction in connected speech.
Full pronunciation guide