Read the sentence.

I cannot attend the play unless I finish my homework first, so I decided to get to work.

What accurately describes the underlined portion of the sentence? unless i finish my homework.

adjectival clause

adverbial clause

appositive phrase

prepositional phrase

adverbial clause

Explanation:

Unless is a conjunction that creates the condition under which the speaker can attend the play. The underlined portion is a clause because it contains its own subject (I) and verb (finish). Since the clause is describing when the speaker can attend the play, it is an adverbial clause.

A phrase does not have a subject and a verb. An appositive phrase is a noun phrase that renames a noun. A prepositional phrase usually tells where one thing is in relation to another. It begins with a preposition and ends with a noun or pronoun.