‘Ran’ is the past tense form of the verb ‘run.’ In English, verbs describe actions or states of being. Since ‘ran’ indicates an action that has already occurred, it functions as a verb in a sentence.
For example, in the sentence ‘She ran to the store,’ the word ‘ran’ describes what she did and tells us the action took place in the past. Thus, in grammatical terms, ‘ran’ is classified as a verb.