Identify the -ing form as the Participle or the Gerund Remove the crystals by filtering. Вопрос 42 Ответ a. gerund b. participle I

The -ing form "filtering" in this sentence is acting as a gerund. A gerund is a verb form that functions as a noun in a sentence. In this case, "filtering" is the object of the preposition "by" and is used to describe the action of removing the crystals.