Sentence examples for not i from inspiring English sources

"not I" is grammatically correct and can be used in written English.
It is a form of the pronoun "I" used in a negative statement or question. It is typically used for emphasis or to show contrast. Example 1: Not I, but she, was responsible for the success of the project. Example 2: Did you finish your homework? Not I, I forgot to do it. Example 3: Not I, but my sister has a talent for playing the piano.