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When using the perfect tenses of verbs, it's necessary to add a/an A. irregular verb. B. infinitive. C. helping verb. D. suffix.

User Matt Roy
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When using the perfect tenses of verbs, it's necessary to add a helping verb, The answer is letter C. Helping verbs helps in conjunction to connect it with a mood or time of the verb. The examples of helping verb are will, shall, may, might, can, could, and must.
User Thennarasan
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