In which of the following sentences is the underlined word an adverb? August 30, 2020 Speech and Language Development In which of the following sentences is the underlined word an adverb? a. A turtle is a [slow] animal. b. A turtle crawled [slowly] through the grass. Answer: b. A turtle crawled [slowly] through the grass. Learn More : Share this Share on FacebookTweet on TwitterPlus on Google+