Problem: Produce a sentence that would be considered grammatically unacceptable

Answer: Reports on the covers of which the government prescribes the height of the lettering almost always put me to sleep.

Problem: Produce a sentence that would be considered grammatically unacceptable

Answer: Here's a knife which for you to cut up the onions with.

Problem: Produce a sentence that would be considered grammatically acceptable

Answer:
Calvin will fire someone today, but I don't know who.