Read the following paragraph. a verbal may belong to one of three categories. it may be a participle, which is used only as an adjective. it may be a gerund, which always ends in -ing and functions as a noun. finally, it may be an infinitive, which is preceded by to and functions as a noun, adjective, or even an adverb. yet verbals still look very much like verbs. which one of six types of expository structure does this paragraph illustrate? simple listing chronological order cause/effect spatial order comparison/contrast order of importance