Problem: Produce a sentence that would be considered grammatically unacceptable

Answer: There is too likely to be a riot to be a serious discussion of the issues.

Problem: Produce a sentence that would be considered grammatically acceptable

Answer: The kennel in which Mary keeps drugs and Fido sleeps has been stolen.

Problem: Produce a sentence that would be considered grammatically unacceptable

Answer:
Mary claimed that would eat cabbage, Holly.