In the sentence "He is afraid of the night", what part of speech is night??

Question

He = subj
is = verb
afraid = pred adjective
of = preposition
the = article
night = ___________ (What completes a prepositional phrase?)

http://grammar.ccc.commnet.edu/grammar/prepositions.htm

Let me know what you decide, and I'll be happy to give you feedback.

=)

My cent-and-a-half for this question. HE is a pronoun (part of speech) which functions in this sentence as a subject.