'countries' is plural, meaning it refers to more than one country.. 'country's' is possessive.
"In many countries, several different languages are spoken."
" That country's national language is...."
The correct possessive form is countries'. Example use:All of the countries' capitals are listed at the left of the map.
The plural possessive form is countries'.Example: All of the countries' delegates had to agree to the plan.
The singular form for the plural noun countries is country; the singular possessive form is country's.
The possessive form of the singular noun country is country's.The plural form of the noun country is countries.The plural possessive form is countries'.Examples:The country's income is derived mainly from tourism.All of the countries' representatives were in attendance as the meeting began.
The possessive form of the plural noun countries is countries'.Example: All of the countries' delegates had to agree to the plan.
The word countries is the plural form of the singular noun country.The possessive form of the plural noun is countries'.The singular possessive form is country's.
The plural form for the noun country is countries.The plural possessive is countries'.Example: The success was the result of many countries' cooperation.
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 of the noun country is countries.The plural possessive form is countries'.Example: All of the countries' representatives have arrived.
The plural form of the noun country is countries.The plural possessive form is countries'.Example: All of the countries' representatives have been seated.
The plural form for the noun country is countries.The plural possessive is countries'.Example: The success was the result of many countries' cooperation.
The plural possessive of "country" is "countries'".