One question on 6A, problem #11. My son struggles getting a nominative in the predicate consistently. His current method is to repeat the subject (e.g. No bats are blind bats), which I tell him isn’t allowed (based on example), but he requests a better reason than that. (It being circular didn’t impress him, either.) Help?
I know what you mean. Many of my students have had the same struggle. Usually, I suggest that they use the genus of the subject (e.g. No bats are blind mammals), but I have accepted a repeated subject (No bats are blind bats) because the adjective (blind) keeps it from being truly circular.