Final answer:
The word "do" is a helping verb that supports the main verb in a sentence.
Step-by-step explanation:
The word “do” is a helping verb in English grammar. Helping verbs are used to support the main verb in a sentence, and they can show tense, mood, voice, and aspect. In the case of “do,” it is commonly used as a helping verb in questions, negations, and emphatic statements.
For example:
Question: Do you like ice cream?
Negation: I do not want to go.
Emphatic: I do love swimming!
Learn more about helping verb