Also called modal auxiliary verbs, modal verbs are used along with a main verb to express possibility, ability, permission, necessity, and others. Modal verbs, modal auxiliary verbs, modal auxiliaries or simply modals are only used in combination with “ordinary verbs”. They have no inflection at all as they are always followed by the infinitive form of a verb. After reading the statements below, check the correct alternative based on the correct use of the modal auxiliary verbs in English.

I. CAN as a modal auxiliary verb is used to express present ability, permission and polite request.

II. SHOULD as a modal auxiliary verb is used to express opinion, advice, necessity and recommendation.

III. MAY as a modal auxiliary verb is used to express obligation, firm necessity, logical conclusion and probability.

IV.OUGHT TO as a modal auxiliary verb is used to express intention, permission, supposition with doubt and past habits.

V. MUST as a modal auxiliary verb is used to express supposition, moral duty, strict recommendation, regret and insistent advice.

Based on the information gathered after reading the propositions provided, it is possible to say that is (that are) correct.