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: Calvin will eat.

SOLUTION: acceptable

PROBLEM: The teacher ordered the two boys both to pay close attention.

SOLUTION: acceptable

PROBLEM: John that we are looking for showed up.

SOLUTION:
unacceptable