A present continuous tense describes an action that is happening right now.
I am playing tennis.
In the sentence above, the action of “playing tennis” is happening right now, but eventually it will be over.
To form the continuous tense, we simply add -ing at the end of the main verb and add the auxiliary verb to be - is, am, are (conjugated or form changed) before it.
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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.