There are three simple verb tenses:
Simple Present - The simple present tense indicates an action that is regular or a general truth or a habit.
The dog barks at the mailman.
Simple Past - The simple past tense indicates an action that began and ended in the past.
The dog barked at the mailman.
Simple Future - The simple future tense indicates an action that will happen in the future.
The dog will bark at the mailman.
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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.