What’s a participial phrase
A participle is a verb form that serves as an adjective. They can be either present or past participles, depending on which principle part of the verb is used.
Present participle: living, hearing, etc., with -ing as the ending.
Past participle: a verb’s 3rd principal part, such as walked, said, gone, etc.
A participial phrase includes the participle and other words directly connected by meaning. It modifies (describes) a noun in the main clause of the sentence.
Seeing his sister, the little boy ran to her.
Attached by Scotch tape, the pages formed a large chart.