Helping verbs are a special category of verbs. They do not mean anything on their own. They just "help" the main verbs to express their full meanings, and are necessary for grammatical structure of a sentence.
All the helping verbs can be divided into 3 broad groups:
Primary Helping Verbs
[these verbs change form]
Modal Verbs or Modal Auxiliaries
[these verbs NEVER change form]
[partly modal, partly main verb]
Be (am, is, are, was, were, being, been)
DO (does, do, did)
HAVE (has, have, had, having)
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The correct answer is
The smallest number is the one that comes first while counting.
To arrange the given numbers in order from smallest to greatest, find the smallest number among all the given numbers.
21 is the smallest number.