Which part of speech is defined as showing action or state of being?

The correct answer is the part of speech that refers to showing action or state of being, which is the verb. Verbs are essential components of sentences as they convey what action is being performed or indicate the state of an entity. For instance, in the sentence "She runs every morning," "runs" is the verb that indicates the action being taken by the subject. Similarly, in the sentence "He is tired," "is" serves as a verb that denotes the state of being of the subject. Understanding verbs is fundamental in identifying the actions and conditions that drive the meaning of sentences.