The plural form would be PCs; the plural possessive would be PCs' (the singular possessive is PC's).
Example: "Their PCs' memory cards were not of the same type."
* Possessives are the reason that apostrophes are not used to form plurals. But they do appear occasionally in that role, where it is needed to indicate what is being pluralized, e.g. "He sent many SOS's." This is very seldom necessary.
Computer's is the singular possessive form of the noun.
computers'
The possessive form of the plural noun computers is computers'.Example: The computers' cost will be amortized over two years.
singular possessive = computer's The computer's screen is broken. plural possessive = computers' The computers' screens are broken
The plural possessive is the Hines's vehicle.
The plural form of the noun porch is porches.The plural possessive form is porches'.
Only nouns and pronouns have possessive forms. The word 'write' is a verb.
The plural form for the noun colony is colonies. The plural possessive form is colonies'.
The possessive form for the plural noun volunteers is volunteers'.
The plural possessive noun is neighbors'. You have spelled it correctly.
Centuries' is the plural possessive of the singular noun century.
Lomaxes is the plural form. Lomax's is the singular possessive. Lomaxes' is the plural possessive.
The singular possessive form is mother's.The plural possessive form is mothers'.
singular possessive of "eagle": eagle's plural possessive of "eagle": eagles'