This document discusses the uses of infinitives and gerunds in English grammar. Infinitives are the basic form of a verb without inflection, and are used after certain verbs like "want" and "need", after adjectives, and to express purpose or reason. Gerunds are verbs with "-ing" added, and can act as subjects or objects in a sentence, or follow certain verbs like "like" and "enjoy", or prepositions. Examples are provided to illustrate the uses of infinitives and gerunds.