Verb Auxiliary (Helping) Verbs: These verbs are used with main verbs to create different tenses, moods, voices, etc. Examples: have, has, had, do, does, did, can, could, will, would, shall, should, may, might, must. Example sentence: He has finished his homework. Modal Verbs: These are a type of auxiliary verb that express possibility, necessity, ability, permission, etc. Examples: can, could, will, would, shall, should, may, might, must. Example sentence: You can borrow my pen.