Problem: Produce a sentence that would be considered grammatically acceptable

Answer: To finish it on time made quite a statement, didn't it?

Problem: Produce a sentence that would be considered grammatically unacceptable

Answer: Because in came Aunt Norris, Fanny stopped talking.

Problem: Produce a sentence that would be considered grammatically unacceptable

Answer:
The cages which we donated wire for the convicts to build with are strong.