The possessive form for the plural noun countries is countries' (just as you have it in your question).
Example: All of the countries' flags surrounded the field.
The plural form for the noun county is counties; the plural possessive form is counties'.Example: The counties' joint task force meets every Wednesday.
The singular possessive form for country is county's.The plural form is counties; the plural possessive form is counties'.
The plural form of the noun county is counties.The plural possessive form is counties'.Example: All of the counties' representatives have been seated.
Yes, counties' is the possessive form of the plural noun counties. example: Not all of the counties' sales taxes are at the same rate.
Yes, the form countries' is the plural possessiveof the plural noun countries.The apostrophe after the ending -s indicates possession.
The singular possessive form is heart's; the plural possessive form is hearts'.
The plural form is valleys. The plural possessive is valleys'.
The plural form is replies. The plural possessive is replies'.
The plural form is founders. The plural possessive is founders'.
No, it is singular, the possessive form of it is its. The plural form of it is they or them, and the possessive form is their.To answer the question directly: there is no such word as ITS'.
The plural form is branches. The plural possessive is branches'.
The plural possessive form of "mass" is "masses'".