Harry looked angrily at the referee. (When such verbs = do indicate physical action, they function as action verbs and are followed by adverbs.) Helping verbs accompany action or linking verbs, allowing them to express with great precision matters such as possibility, obligation, and time. Common helping verbs include the following: Has been had (to) Have do shall Had does will Am did going (to) Is used (to) about (to) Are may would Was might should Were must ought (to) Be have (to) can Being has (to) could o I should ask my parents. (helping verb should with action verb ask) o The driver was being lifted onto a stretcher. (helping verbs was and being with action vetb lifted. e Principal parts—verbs change in form to show time (tense) distinctions. For every action verb, tenses ate built from three principal part: present, past, and past participle. The present is the ptincipal part you would look up in the dictionary (win, skip, go). If | the subject of a verb is a singular pronoun (he, she, tt) or a singular noun, add an s or es to the dictionary form (wins, skips, goes). 11