This document discusses the gerund and infinitive in English grammar. It defines the gerund as a verb form ending in "-ing" that can serve as a present participle, verbal noun, or take an object as in the sentence "Eating this cake is easy." It provides examples of gerund clauses serving as subjects, direct objects, and complements. It then defines the infinitive as a verb form that can take objects/complements and form an infinitive phrase. It notes infinitives do not have expressed subjects. It provides examples of infinitive clauses serving as subjects.