Which type of verb indicates that the subject is performing the action?

An active verb is the type that clearly shows the subject performing the action of the verb. In a sentence that contains an active verb, the subject is directly engaged in the deed or activity described. For example, in the sentence "The dog chased the ball," "chased" is an active verb that indicates that the subject, "the dog," is the one carrying out the action.

In contrast, a passive verb describes an action that is being received by the subject rather than enacted by it. For example, in the sentence "The ball was chased by the dog," the focus shifts to the ball, which is receiving the action rather than performing it.

An intransitive verb, while it may indicate an action related to the subject, does not require a direct object to complete its meaning, meaning it may not always demonstrate that the subject is performing an action in the same direct way as an active verb.

An auxiliary verb, also known as a helping verb, assists the main verb in forming different tenses or moods but does not indicate the action itself on its own.

Thus, the focus on the subject actively performing the action is what classifies the verb as active.