Which of these describes the primary function of a verb in a sentence?

The primary function of a verb in a sentence is to show action or state of being. Verbs are essential components of sentences as they convey what the subject is doing (action) or the state the subject is in (being). For example, in the sentence "She runs every morning," "runs" is the verb that describes the action. In another example, "He is tired," "is" functions as a verb that expresses a state of being.

Other choices describe different linguistic functions. Describing a noun pertains to adjectives, which provide more information about the noun. Connecting clauses refers to conjunctions, which link phrases or sentences. Introducing a question relates to interrogative words or auxiliary verbs, which help in forming questions. However, none of these functions capture the essence of what a verb fundamentally does in conveying action or a state of existence.