In these worksheets, students rewrite sentences using possessive nouns (The bone belongs to the dog. / The dog's bone.). The possessive form of noun is formed by adding an apostrophe and an "s" (or just an apostrophe for plural nouns already ending in an "s").

we were awakened by the birds' chirping. the students' grades have improved over the last few months. *there won't be an extra s because the nouns are plural.