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Prepositional phrases or participial phrases
Yes, introductory participal phrases and adverb clauses are set off from main clauses by commas
First off, there is technically no participial phrase in the sentence currently, for participial phrases must be set off by commas. If commas were included at the appropriate places to indicate a participial phrase, though, the sentence would read, "Simple jewelry, left behind by ancient Egyptians, can be very valuable today." The participial phrase in this case is "left behind by ancient Egyptians," because it modifies the subject (jewelry), is set off by commas, and is not a sentence in itself.
Gerund phrase talks about noun while participial phrase is about the adjective.
Type the participial phrase in this sentence. Type the participial phrase in this sentence.