This document provides an overview of the uses of gerunds and infinitives in English. Gerunds, which are verb forms ending in "-ing", can be used as the subject or object of a sentence, after certain verbs like "enjoy" and "avoid", and after prepositions. Infinitives, which use the word "to" before the base verb form, can be used after verbs like "decide" and "want", after adjectives like "difficult", after question words, and to indicate purpose or reason. The document concludes by providing a link to an online exercise for practicing distinguishing between gerund and infinitive uses.