This document provides information about participial phrases in English grammar. It defines participles and participial phrases, and explains that a participial phrase contains a participle plus other modifying words. The document discusses the forms and uses of present and past participles, including their use in reducing adjective and adverb clauses. It provides examples of participial phrases and discusses their punctuation and positioning within sentences. The document concludes with practice exercises transforming sentences containing clauses into sentences using participial phrases.