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:
A book was sent Louis.
answer:
unacceptable


question:
He's the happiest that I've ever seen him.
answer:
acceptable


question:
I am not certain about when he will come.
answer:

acceptable