In the line "how love fled" from "when you are old," love refers to a. the poem's subject, maud gonne. b. the poem's author, yeats. c. young people who believe they're in love. d. the years gone by.

My answer is D) The years gone by

The following is my reasoning:

This poem has a theme of losing a loved one and the process of aging and in the lines "Murmur, a little sadly, how Love fled / And paced upon the mountains overhead / and hid his face amid a crowd of stars." The narrator wrote this poem for his wife to read in her old age, assuming he wrote this for her before his own death (this statement is supported by the first stanza of the poem).

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.