When should the ves ending be added to form plural nouns?
a. when the noun ends in s
b. when the noun ends in a consonant and y.
c. when the noun ends in a vowel and y. or
d. when the noun ends in f or fe?

to create suspense.

la respuesta a esta pregunta es

sinco

i say that the right answer is: three personal subject pronouns. that’s because you will see “she” two times, referring to the librarian, and “they” one time, referring to the books. personal subject pronouns are used to replace common nouns or proper names.

the only possessive noun it’s present on the first sentence, when the speaker refers to “his” father.

many is the pronoun that is used in this sentence. many is a quantifier that determines the amount of discoveries. when we use quatifiers followed by nouns, they act as determiners, but when they are used without a noun, as it is this case, they are pronouns.