TASK DEFINITION: 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".
PROBLEM: The strong winds cleared the skies.

SOLUTION: acceptable

PROBLEM: He never achieved anything, didn't he?

SOLUTION: unacceptable

PROBLEM: Pilots who can fly barrel rolls say that for me to try to do it in a glider would be hazardous.

SOLUTION:
acceptable