You're given a sentence and your task is to classify whether the sentence is acceptable or not. Any sentence which is grammatically correct, has a naturalistic text, is written by a native speaker and which minimizes superfluous content is acceptable, otherwise unacceptable. If the sentence is acceptable then write "acceptable", otherwise "unacceptable".

Ann copied the manuscript, but she didn't finish it.
acceptable

That's the kindest answer that I ever heard.
acceptable

John forgot.

acceptable