BBC Masterclass: Participle Clause A participle is a form of a verb - either ING or Past Participle (3rd form of a verb). A participle clause is a subordinate clause which begins with a participle. They usually show things like event order, time, cause and effect: Stepping on camera, I relaxed completely. (When I stepped on camera) Filmed inside, the footage was too dark to use. (Because it was filmed inside) For more, visit our website: http://www.bbc.co.uk/learningenglish/english/course/toward