Running quickly is good exercise.
◦ Parts of Speech:
◦ Running: Gerund (verb acting as a noun)
◦ quickly: Adverb
◦ is: Verb (linking verb)
◦ good: Adjective
◦ exercise: Noun
This sentence highlights the versatility of words; "running" acts as both a verb and a noun, depending on its function in the sentence.