Identify the underlined portion of the following sentence.
the children built a sandcastle (< -- this portion is underlined) while their father read a book
-adverb clause
-adjective clause
-subordinae clause
-independent clause

and adverbial clause is a subordinate clause that is used as an adverb to modify a verb, and adjective, or a(n)
-adverb
-noun
-participle
-pronoun

an infinitive is a( for that usually begin with to ans is used as a noun, an adjective, or an adverb.
-verb
-noun
-pronoun
-adjective

identify the infinitive phrase in the following sentence.
wasps are starting to build a nest in our garage.
-to build a nest
-in our garage
-are starting
-starting to build