Book cover becomes "book covers" then you add an apostrophe to make book covers'.
Hope I helped! XD
The singular possessive is bookshelf's.
The possessive form is Amos's.
The singular possessive form is herd's.
The singular possessive form is heart's; the plural possessive form is hearts'.
The singular possessive form is grotto's.
The singular possessive form is lesson's.
The singular possessive form is week's.
The singular possessive form of "classmate" is "classmate's."
The possessive form is Amos's.
The singular form is goose; the singular possessive form is goose's.The plural form is geese; the plural possessive form is geese's.
The singular possessive form of county is county's.
Quantum is singular, not singular possessive. The singular possessive form is quantum's.
The singular possessive form is speculum's.
The singular possessive form is frontiersman's.
The singular possessive form is aircraft's.
The singular possessive form is contralto's.
The singular possessive form is herd's.
The singular possessive form of the word "jury" is "jury's."