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The plural form of the noun tuna (the fish) is tunas.

The plural possessive form is tunas'.

Example: These tunas' breeding ground is the Gulf of Mexico.

The noun tuna (the food substance) is an uncountable noun.

The singular and the plural possessive form is tuna's.

Example: The can of tuna's weight is five and a quarter ounces, including water.

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11y ago

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