“Running fast they caught the last bus.” What type of phrase is “Running fast”?

Foundational Concept: An adverb phrase is a group of words that functions as an adverb, modifying a verb, an adjective, or another adverb. It typically answers questions like how, when, where, or to what extent an action occurs.

Correct Option: In the sentence, "Running fast" describes how "they caught" the bus. Since it modifies the verb "caught" by providing information about the manner of the action, it functions as an adverb phrase.

• Noun phrase: A noun phrase acts as a noun, serving as a subject, object, or complement. "Running fast" does not name a person, place, or thing.
• Adjective phrase: An adjective phrase modifies a noun or pronoun. "Running fast" does not describe "they" or "bus" directly as an adjective would.