FORMS OF DO do, does, did FORMS OF HAVE have, has, had FORMS OF BE be, am, is, are, was, were, been MODALS can, could, may, might, must, shall, should, will, would, ought toĭo, does, or did requires the base form of the main verb. The appropriate forms of main verbs and helping verbs are discussed in this section. Do, have, and be change form to indicate tenses modals do not. Helping verbsĭo, have, be, and MODALS such as can and may all function as helping verbs that work with main verbs to express certain verb TENSES and MOODS. After two weeks in Istanbul, we had ate eaten a lot of Turkish delight. For vacation last spring, my family gone went to Turkey. One simple rule is to use the past tense if there is no helping verb and to use a past participle if there is a helping verb. ![]() Some writers get confused about when to use the past tense and when to use a past participle. ![]() BASE FORM PAST TENSE, PAST PARTICIPLE, PRESENT PARTICIPLE
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