There are two accepted forms for possessive singular nouns that end with an s:
Add an apostrophe (') after the existing s at the end of the word:
Add an apostrophe s ('s) after the existing s at the end of the word:
Example:
I can calculate the radius' measurement.
I can calculate the radius's measurement.
The possessive form for the singular noun roof is roof's.The plural form for the noun roof is rooves.The plural possessive form is rooves'.
The noun radii is already a plural. The singular is radius.
The plural possessive is diamonds'.
The Correct possessive form of "gables" is: A= gables'
Well, honey, "radii" is the plural form of "radius." So, if you're talking about one of those lines from the center of a circle to any point on its circumference, that's a radius. But if you're feeling fancy and need to talk about more than one, then you're dealing with radii. It's as simple as that, darling.
The singular possessive form of "test" is "test's".
The singular possessive pronouns are mine, yours, his, hers, and its. The singular possessive adjectives are my, your, his, her, and its.
The singular possessive is ant's.The plural possessive is ants'.
Museum is singular. Museum's is singular possessive. Museums is plural. Museums' is plural possessive.
The singular possessive form is classmate's.
The singular possessive of dish is dish's
Taco's is the singular possessive.
The singular possessive is biker's; the plural possessive is bikers'.
The singular possessive is fish's.
Grave's is the singular possessive.
Buzz's is the singular possessive.
The singular possessive is Martin's.