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: Where did the policeman meet several young students?

SOLUTION: acceptable

PROBLEM: Everyone who had been worrying himself stiff said that he was relieved.

SOLUTION: acceptable

PROBLEM: The guide has been taken John to the library.

SOLUTION:
unacceptable