Which term refers to a verb typically used with another verb to indicate possibility?

• A. Helping Verb
• B. Auxiliary Verb
• C. Adjective
• D. Modal Auxiliary

Answer: (D)

The key idea here is identifying a verb that is used with another verb to express possibility. That role is filled by a modal auxiliary. Modal auxiliaries are a specific subset of auxiliary (helping) verbs like can, could, may, might, must, shall, should, will, and would. They come before the main verb and express mood—particularly possibility, permission, or obligation. For example, in sentences like “We might go tomorrow” or “She could be there,” the word before the main verb signals possibility. Adjectives describe nouns and don’t partner with another verb to show possibility, and the broader term “auxiliary verb” covers many helping verbs that handle tense or aspect, not just possibility.