Hi!!!! I need help.

Hello! What's up? Hope every1's fine. Now, the reason I posted... My cruel, evil (but okay) teacher gave me some homework and I can't figure out one problem:

1- In the sentence: "The charge for the repair work on the car was very low.", the phrase "for the repair work" is prepositional, infinitive, or participal? And how is it used? Like a noun? An adjective? Or an adverb?

Oh, and if you're so kind to explain to me what's exactly an object of a verb, an object of a preposition and a predicate nominative, that would help me out a lot. Thanks a bunch in advance! I'll be here all week! (Well, actually, I can't. My homework's due tomorrow. -_-¡)

for is a preposition in your sentence

noun after verb is the object of the verb and verb can be transitive or intransitive.

transitive verb takes an object directly whereas intransitive goes with a preposition.

eg. I need help. ( I = subject ) ( need = transitive verb ) ( help= noun )

eg. I wait for you. ( wait = intransitive verb as it takes a preposition ' for ' )

I just wanted to single out the object of a verb. And the use of a preposition between the verb and the object