The main verb of a sentence is always one that would change form from base form to past tense, past participle, present participle and, -s forms. When both the past-tense and past-participle forms of a verb end in “ed”, the verb is regular. In all other cases the verb is irregular. The verb “be” is highly irregular, having eight forms instead of the usual five.
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Last updated: 12/15/2017
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