The document defines and provides examples of three types of participles: present participle, past participle, and perfect participle. It focuses on describing the present participle, which is formed by adding "-ing" and can function as both a verb and adjective. The present participle is used in continuous tenses, after verbs of sensation, as an attributive or predicate adjective, as an objective complement, to express result or permission, instead of adjective clauses, as an adverb, to express simultaneous actions, and to combine two sentences into one.