Meaning: This sentence describes a dog running quickly and without any constraints.
Choice of Words: Dog, ran, fast, free are nouns and verbs that describe the dog's actions. Dog is a noun that refers to a domesticated carnivorous mammal that typically has four legs and a tail. Ran is the past tense of the verb run, which means to move quickly on foot. Fast is an adjective that describes something that is moving quickly. Free is an adjective that describes something that is not restricted or confined.