Read the sentence. To finish the test on time seemed an impossible task. How is the phrase "to finish the test on time" used in
the sentence? It is a participial phrase used as an adjective modifying task. It is a verb phrase stating the action of the sentence. It is an infinitive phrase used as the object of the preposition on. It is an infinitive phrase used as the subject of the sentence.
It is an infinitive phrase used as the object of the preposition on.
Explanation: a Infinitve phrase basically is anything with "to" in it, so To finish the test "on" time seemed and impossible task. The only thing that makes this one seem different is the on thats in the sentence, Hope this helps!