Final answer:
A helping verb is a word that is added to another verb to make a verb phrase.
Step-by-step explanation:
A helping verb is a word that is added to another verb to make a verb phrase. It helps one word in a sentence name or describe another word in the sentence. For example, in the sentence, 'She is running,' the helping verb 'is' is added to the main verb 'running' to form the verb phrase 'is running.'
Learn more about helping verbs