Here is a tricky little interactive online quiz with which your motivated learners can test themselves on the finer points of subject-verb and pronoun-antecedent agreement. They need to know that macaroni and cheese is actually a singular noun, and that multiple nouns joined by neither/nor take a singular verb, unlike a regular compound noun. You can choose to just get a raw score for feedback, or you can click the box that says Please explain wrong answers.