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".

Much of that theory is unfounded.
acceptable

I think you need to show yourself more than you do anyone else.
acceptable

Was the child in the school?

acceptable