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 31 Ответ a. gerund b. participle I

In this sentence, the -ing form "pushing" is functioning as a gerund, as it is used as a noun to indicate the action of pushing in the plunger. Therefore, the correct answer is:

a. gerund