The answer is bases' (pronounced bay-seas).
The word basis is singular. The plural is bases.
The plural form of basis is bases(prononounced bayseez).
bases (pronounced bay-sees)
There are two accepted forms for possessive singular nouns ending in s:Add an apostrophe (') after the existing s at the end of the word: basis'Add an apostrophe s ('s) after the existing s at the end of the word: basis'sExample:The basis' veracity is supported by the number of double blind tests conducted.The basis's veracity is supported by the number of double blind tests conducted.
It is singular, even though it ends with the letter -s. The plural is "bases" (BAY-sees). You may also see it as an adjective "basic."
The plural form for the noun zoo is zoos. The plural possessive form is zoos'.Example: The zoos' inspections in our state are done on annual basis.
The plural form of the noun tax is taxes.The plural possessive form is taxes'.Example: All of the taxes' payments are made on a monthly basis.
The plural form of the noun engineer is engineers.The plural possessive form is engineers'.Example: All of the engineers' submissions will be evaluated on an equal basis.
Coaster's is singular possessive. The plural is coasters, the plural possessive is coasters'.
The correct form is "its" for the possessive form in the plural. "Its" is used for both the singular and plural possessive forms, without an apostrophe.
The plural is briefs. The plural possessive is briefs'.
The plural is lads. The plural possessive is lads'.
The plural is trollies. The plural possessive is trollies'.
The plural is relatives. The plural possessive is relatives'.
The plural is stations. The plural possessive is stations'.
Museum is singular. Museum's is singular possessive. Museums is plural. Museums' is plural possessive.
The singular possessive form is heart's; the plural possessive form is hearts'.