This document discusses gerunds and infinitives in English grammar. It begins by defining gerunds as verb forms ending in "-ing" that can function as nouns. It provides examples of how gerunds can be used as subjects, objects of certain verbs, and after prepositions. It then defines infinitives as verb forms preceded by "to" and provides examples of their uses after verbs, adjectives, nouns, and to express purpose. It notes some verbs that can take either gerunds or infinitives with similar meanings and others where the construction changes the meaning. It concludes with exercises changing verbs to gerunds and infinitives.