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:
Robert knows it is essential that he is well behaved.
answer:
acceptable


question:
Calvin will eat.
answer:
acceptable


question:
Jack is claiming you won't need it.
answer:

acceptable