Yes, the form countries' is the plural possessiveof the plural noun countries.
The apostrophe after the ending -s indicates possession.
The plural form of the noun county is counties.The plural possessive form is counties'.Example: All of the counties' representatives have been seated.
The singular possessive form for country is county's.The plural form is counties; the plural possessive form is counties'.
The plural possessive of desert is deserts'.
The plural for the word atlas is atlases; the plural possessive is atlases'.
The plural is oceans and the plural possessive is oceans' (referring to more than one ocean).
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 plural form of the noun county is counties.The plural possessive form is counties'.Example: All of the counties' representatives have been seated.
The singular possessive form for country is county's.The plural form is counties; the plural possessive form is counties'.
Yes, counties' is the possessive form of the plural noun counties. example: Not all of the counties' sales taxes are at the same rate.
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.
Singular possessive: secretary's Plural: secretaries Plural possessive: secretaries'
The plural is lads. The plural possessive is lads'.
The plural is relatives. The plural possessive is relatives'.
The plural form is suffixes. The plural possessive is suffixes'.
The plural form is stepsisters. The plural possessive is stepsisters'.
The plural form is Mexicans. The plural possessive is Mexicans'.
The plural form is echoes. The plural possessive is echoes'.