In the poem mending wall line 6 them refers to

Explanation:

The subtle use of language in "I have come after them and made repair" (line 6) indicates that this is a regular occurrence. The hunters have destroyed sections of the stone wall in the selfish pursuit of their prey and apparently without concern for the landowners, who must work to repair the wall each spring.

this is more of an opinionated response

explanation:

answer it yourself

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.