contrary to most people i think those nonsensical questions are good? because instead of guessing what the sentence means by context it forces you to evaluate each word therefore strengthening your knowledge
Exactly. I love nonsensical questions as they make you think hard. Also, pretty sure there is algorithm behind the structure itself that puts them together.
Analyzing sentences is explicit learning. The whole point of Duolingo is to learn implicitly in order to get procedural skills.
"The man who doesn't know how to draw" should be valid for "그릴 줄 모르는 남자" right?