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".

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

A: acceptable
****
Q: John believed it.

A: acceptable
****
Q: A book was handed to Chris by Pat.

A:
acceptable
****