It depends on whether you're talking about one or many years.
One year's passage.
Five years' time.
The possessive form of "years" is "years'".
The plural possessive form of "grandmother" is "grandmothers'".
The possessive noun form for "the generosity of the elders" is "the elders' generosity."
The plural possessive form of "grandparents" is "grandparents'."
The possessive form of the noun grandfather is grandfather's.Example: I'm spending the weekend at my grandfather's farm.
The singular possessive form of grandmother is grandmother's, and the plural possessive form is grandmothers'.
The possessive form is: four years' service
The possessive form of the word "years" is "years'".
The possessive form for "two years" is "two years'" with an apostrophe after the "s."
The plural form of the noun year is years.The plural possessive form is years'.example: I have five years' experience as a chicken plucker.
The possessive form of the noun beaver is beaver's.Example: That beaver's lodge has been inhabited for a number of years.
year's leave
The plural form of the proper noun Lewis is Lewises.The plural possessive form is Lewises'.example: The Lewises' children are four and six years old.
The plural form of the proper noun Martinez is Martinezes.The plural possessive form is Martinezes'.Example: The Martinezes' children are six and ten years of age.
The possessive form of the noun escape is escape's.example: His escape's result was another four years added to his sentence.
The possessive form of the singular noun wharf is wharf's.Example: The wharf's vendors have been here for many years.
The singular possessive form is heart's; the plural possessive form is hearts'.
The plural form of the noun dinosaur is dinosaurs.The plural possessive form is dinosaurs'.example: They spent years assembling all of these dinosaurs' skeletons.