The document discusses gerunds and infinitives. It defines a gerund as a verb form ending in "ing" that can act as a noun, such as replacing a noun phrase. It lists characteristics of gerunds such as performing functions of subject, object or predicative and being modified by adverbs or prepositions. Examples of gerund use are provided. Infinitives are defined as verb forms starting with "to", such as "to do". It notes the role of "to" as part of the verb. Characteristics of infinitives include acting as nouns, adjectives or adverbs. Examples of infinitive use are also given. Exercises for gerunds and infinitives complete the summary