6 Easy Grammar Rules for Gerunds & Infinitives When I introduce a gerunds and infinitives activity in class, I am usually faced with looks of quiet desperation or grim determination. Most students find the endless list of verbs to memorize daunting, to say the least! Also, most textbooks don’t cover the fact that there ARE a few helpful rules for deciding whether to use a gerund or an infinitive in a sentence. The next time you’re doing gerunds and infinitives in class, try teaching the rules below—your students will thank you! The Basics Gerund: VERB + -ING ( eating, going, studying ) Infinitive: TO + BASE VERB ( to eat, to go, to study ) A gerund is the present participle ( -ing ) form of the verb. An infinitive is to + the base verb (the verb with no ending). Both gerunds and infinitives are action words (i.e., verbs) in meaning, but they act like nouns in the sentence. They always take a noun position: a su...