This document discusses gerunds and infinitives in English grammar. It defines a gerund as a verb form ending in "-ing" that functions as a noun, such as "swimming" or "reading". Infinitives are defined as verb forms preceded by "to", such as "to swim" or "to read". Examples are provided of sentences containing gerunds and infinitives. Gerunds typically relate to real or completed actions, while infinitives relate to unreal, general or future actions.