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:
I'll work on it if I can work on it.
answer:
acceptable


question:
Calvin had been eating.
answer:
acceptable


question:
How did you solve the problem?
answer:

acceptable