Problem: Produce a sentence that would be considered grammatically acceptable

Answer: Every student in Mary's class, by virtue of being in her class, is working on polarity items.

Problem: Produce a sentence that would be considered grammatically unacceptable

Answer: Doug cleared at the table.

Problem: Produce a sentence that would be considered grammatically unacceptable

Answer:
Each candidate who has any interest in semantics will be admit ted to the department.