Problem: Produce a sentence that would be considered grammatically unacceptable

Answer: Will not John go to school?

Problem: Produce a sentence that would be considered grammatically unacceptable

Answer: When Dr Jones died of apoplexy didn't he, Mary Crawford went to live with his wife.

Problem: Produce a sentence that would be considered grammatically unacceptable

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