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: Do not use these words in the beginning of a sentence.

Answer: acceptable


Question: Which bed did Tom sleep on?

Answer: acceptable


Question: Every student in Mary's class is working on negative polarity.

Answer:
acceptable