One set of books, two sets of books. Set is singular.
Yes, the form book's is the singular possessive form.Example: The book's cover is torn.The plural form for the noun book is books; the plural possessive form is books'.
The possessive form of the plural noun teachers is teachers'.The possessive form for "the books of the teachers" is "the teachers' books".
The singular pronoun "she" has the plural "they."The singular possessive is her or hers and the plural possessive is their or theirs.A possessive adjective is a word that is placed before a noun to describe that noun as belonging to someone or something. The plural possessive adjective for "they" is their.Example: Those are their books.A possessive pronoun is a word that takes the place of a noun that belongs to someone or something. The plural possessive pronoun for "they" is theirs.Example: Those books are theirs.
The plural personal pronoun for the singular "he" is "they."The singular possessive is his and the plural possessive is their or theirs.A possessive adjective is a word that is placed before a noun to describe that noun as belonging to someone or something. The plural possessive adjective for "they" is their.Example: Those are their books.A possessive pronoun is a word that takes the place of a noun that belongs to someone or something. The plural possessive pronoun for "they" is theirs.Example: Those books are theirs.
Because the noun books is plural, the apostrophe that shows it's a possessive goes after the s: books'.Example: Most of the books' covers were undamaged.If a noun is singular, the apostrophe usually goes before the s: book's. So, if the noun is plural: The books' important lessons made a positive impression on everyone who read them. (More than one book.) But if it's singular: The book's important lessons made a positive impression on everyone who read it. (Just one book.)
The possessive form for the plural noun wives is wives'.
The plural possessive noun of molecules is molecules' .
The plural form for the noun buzz is buzzes; the plural possessive form is buzzes'.
The plural possessive noun for "vowel" is "vowels'".
The word sisters is the plural form; the plural possessive is sisters'.
The plural form for the noun tree is trees.The plural possessive form is trees'.
The noun "branch" is a regular plural noun, a noun that forms its plural by adding "s" or "es". The plural form of branch is "branches".The plural possessive form is branches', a regular plural possessive.