I am in class twelve, Here 'am' is-

The answer given as "principal verb" is actually not correct in this context. The word "am" in the sentence is functioning as an auxiliary verb, which means it helps to form the tense or mood of another verb, typically the main verb. In this case, "am" helps indicate the present tense of the state of being.

To clarify:

    
• Cognate verb: This involves verbs that have a relationship in meaning with another verb.
    
• Principal verb: This usually refers to the main action verb in a sentence.
    
• Auxiliary verb: These verbs (like "am," "is," "are," "have") help to form various tenses.
    
• Factitive verb: These verbs describe the process of making something be in a different state.

In your sentence, "am" serves as an auxiliary verb indicating the present state of being in class twelve.

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