Problem: Produce a sentence that would be considered grammatically acceptable

Answer: I go, run, swim, jump, fly, crawl, dance, walk.

Problem: Produce a sentence that would be considered grammatically unacceptable

Answer: I insist in seeing all the students who started out the term in my class through.

Problem: Produce a sentence that would be considered grammatically unacceptable

Answer:
Mary has more friends that two.