The possessive form of the singular noun plumber is plumber's.
example: The plumber's assistant carried all of the equipment.
The singular possessive form for hydraulics is hydraulics'. The noun hydraulics is the singular form, there is no plural form. If you remove the ending 's' the word hydraulic is the adjective form.
Class's = the possessive form of the singular noun class.Classes' = the possessive form of the plural noun classes.Examples:The class's pet frog was called Robert. (one class had a pet frog called Robert)All of the classes' students were at the assembly. (the students from all classes were at the assembly)
The possessive form for the noun utility is utility's.
The possessive form for the noun process is process's.
The possessive form of the noun inventor is inventor's.Example: The inventor's patent was finally granted.
The possessive form of the singular noun plumber is plumber's.example: The plumber's assistant carried all of the equipment.
The form plumber is the singular form; the plural form is plumbers.
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 week'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 speculum's.
The singular possessive form is herd's.