Past tense verbs describe actions that have already happened.
Most past-tense verbs are regular and end in -ed. However, some verbs in the past tense are irregular too.
Regular : The kids played till late evening.
Irregular : He ran fast to catch the train.
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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.