instruction:
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".
question:
He never achieved anything, didn't he?
answer:
unacceptable


question:
The truck rumbled into the driveway.
answer:
acceptable


question:
Sonatas are tough to play on this violin.
answer:

acceptable