What is the function of a helping verb?

• A. It helps the main verb tell about an action or make a statement.
• B. It describes nouns.
• C. It marks the tense of adjectives.
• D. It forms the past participle.

Answer: (A)

A helping verb, or auxiliary, is a word that works with the main verb to add information about tense, aspect, mood, or voice, and to help form questions or negatives. This function is why the statement that a helping verb helps the main verb tell about an action or make a statement is the best choice—examples like “is reading” or “have finished” show how the auxiliary supports the main verb to express timing and completeness. The other ideas don’t fit because describing nouns is the job of adjectives (or determiners), adjectives don’t carry tense, and forming the past participle is a word-formation detail of the main verb itself, not the primary function of the helping verb (though auxiliaries can accompany a past participle to form perfect tenses).