The answer is "(He) reading".
A participial phrase is what?
A participial phrase is an adjectival construction that combines a participle (past, present, or perfect) with other words such as nouns, adjectives, adverbs, and prepositional phrases. Like adjectives, participles are used to modify nouns and their equivalents.
What is a noun?
In a sentence, a noun is a word that refers to a specific person, place, thing, or animal. Depending on the context, a noun may serve as a subject, direct object, indirect object, subject complement, object complement, appositive, adjective, or adverb. Many nouns in English do not take gender into account.
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