Question

M: It's 100% silk, ma'am.
W: But I don't have enough money with me now.
M: How much do you have?
W: Thirty dollars, but I need two dollars for the bus.
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In this dialogue, what is the part of speech of 'for the bus'?
Is it an adjective phrase or an adver phrase? Does 'for the bus' modify 'dollars' or the verb 'need'?

Answer 1

Does it tell why "I need"?
If so, then it's adverbial.

Answer 2

Thank you. What about the follwing explanation?

1. I need two dollars which can be used for the bus.

2. I need two dollars used for the bus.

3. I need two dollars for the bus.

(If we explain in this way, can't 'for the bus' modify 'dollars'?)

Answer 3

Because "for the bus" is not telling what the dollars look like or are like. That phrase is not DESCRIBING the dollars.

However, it is answering one of the questions that adverbs are used for:
"Adverbs can be single words, or they can be phrases or clauses. Adverbs answer one of these four questions: How? When? Where? and <b>Why?</b>"
http://www.chompchomp.com/terms/adverb.htm

Answer 4

Thank you for our clarification.