<span>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 </span><span>will, shall, may, might, can, could, and must.</span>
<em>awncer</em><em>=</em>
<h3>
emotional appeal</h3>
Bro how would we know if we don’t know anything about the project