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:
We were thankful that no one had been hurt.
answer:
acceptable


question:
How much harder has it rained, when you see a faster flow in the river?
answer:
acceptable


question:
A serious accident happened yesterday.
answer:

acceptable