Why does colin tell mary that he is going to die after she doesn’t visit him? a. he wants mary to feel sorry for him. b. he wants mary to call the doctor for him. c. he wants mary to leave misselthwaite manor. d. he wants mary to stop going to the secret garden.

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.