The document provides an overview of infinitives in English. It defines infinitives as "to + simple form of the verb" and notes they can act as nouns. Examples are given of single verb and verb phrase infinitives. Infinitives can be used after certain verbs and as the object of verbs. The differences between using gerunds and infinitives after certain verbs like begin, prefer, try, remember and regret are explored with examples. Infinitives of purpose and structures like "be + adjective + infinitive" are also covered.