What is a Gerund? A gerund is a verb that is used as a noun. A gerund is formed by adding -ing to the present form of a verb. What is an Infinitive? An infinitive is a verb that is used as a noun, adjective, or adverb. The word to is known as the sign of the infinitive. What is a Participle? A participle is a verb that is used as an adjective. The two types of participles are present participles and past participles. Read More...