Answer:6. How do you define a modal verb? A modal verb is a type of auxiliary (helping) verb that expresses ability, possibility, permission, or obligation. Examples include "can," "may," "must," and "should."7. Do we usually use a modal verb along with the principal verb? Yes, we usually use a modal verb along with the main verb to express the action or condition. For example, in "She can swim," "swim" is the main verb, and "can" is the modal verb.8. List down two (2) modal verbs that are used for possibility. - Might - Could9. When do we normally use the modal verb 'must'? We normally use "must" to express obligation, necessity, or something that is very likely to be true. For example: "You must wear a seatbelt while driving."10. Use at least one modal verb stating a promise in a sentence. "I will help you with your homework tomorrow."