A participle is a verbal, or a word based off of a verb that expresses a state of being, ending in -ing (present tense) or -ed, -en, -d, -t, -n, or -ne (past tense) that functions as an adjective. A participle phrase is a group of words containing a participle, modifier, and pronoun or noun phrases. The pronoun/noun will act as the recipient of the action in the phrase. A participle phrase acts as an adjective, serving to modify nouns.

Here are some key points about participles and participle phrases:

• A participle is a verbal that is used as an adjective and most often ends in -ing or -ed. Participles modify nouns or pronouns.
• A participle phrase is a group of words consisting of a participle and the modifier(s) and/or (pro)noun(s) or noun phrase(s) that function as the direct object(s), indirect object(s), or complement(s) of the action or state expressed in the participle.
• Participial phrases always function as adjectives, describing a nearby noun or pronoun.
• A participle phrase can be used to modify a noun or pronoun in a sentence.
• A participle phrase can be used at the beginning, middle, or end of a sentence.
• A comma is needed after a participle phrase if it comes at the beginning of a sentence and the following phrase is a complete sentence. If the participle phrase is in the middle or at the end of a sentence, a comma is not needed.
• A present participle phrase will always act as an adjective while a gerund phrase will always behave as a noun.

In summary, a participle phrase is a group of words containing a participle, modifier, and pronoun or noun phrases that acts as an adjective, serving to modify nouns.