Which sentence uses the underlined vocabulary word incorrectly?
a. the chef sauntered the onions and placed them on the hamburger.
b. obstinacy can often times stand in the way of progress.
c. the dog's vociferation made his amount of pain obvious to everyone in a ten mile radius.

the answer is:

when will (v) the books (n) be (v) due?

nouns refer to people (other than pronouns), places and things, whereas verbs describe actions and are usually part of the predicate of a sentence. finally, pronouns can work as nouns and identify the participants in speech.

in the example sentence, "will" is a verb part or auxiliary verb, "be" is an infinitive verb and "books" is a plural noun.