Identify the -ing form as the Participle or the Gerund You can compress the gas, or force its particles closer, by pushing in the plunger. Вопрос 29 Ответ a. participle I b. gerund

In this sentence, "pushing" is functioning as a participle. A participle is a verb form that can function as an adjective (modifying a noun) or part of a verb tense. In this case, "pushing" is modifying the noun "plunger," so it is a participle.