Based on teacher-learner relationship, the best way to ask such question is could you please explain why the exercise is wrong?
Modal verbs are verbs that give personal disposition of the speaker towards the statement. Their past forms are used to show respect or determine a formal context.
Therefore, the correct form of the question is using the past form of modals to ask the question.
Learn more on modal verbs from here: https://brainly.com/question/6250914