How are "mary cassatt: artist and trailblazer" and "young pablo casals" similar?
a.
both depict paris as the center of the artistic world.
b.
both show how music can offer opportunities to poor young people.
c.
both focus on artists who were aided by edgar degas.
d.
both rely on likable first-person narrators..

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.