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: Carlos'
Add an apostrophe s ('s) after the existing s at the end of the word: Carlos's
Examples:
Carlos' mother will pick us up at three.
Carlos's mother will pick us up at three.
Note: If you are a student, use the form that is preferred by your teacher.
The possessive noun Carlos's is the singular possessive form.The plural form of the noun Carlos is Carloses.The plural possessive form is Carloses'.Examples:I like Carlos's new bicycle.The Carloses' children are twins.
The singular possessive form of "test" is "test's".
The singular possessive pronouns are "my," "mine," "your," "yours," "his," "her," and "its."
The singular possessive of "ant" is "ant's" and the plural possessive is "ants'".
Museum is singular. Museum's is singular possessive. Museums is plural. Museums' is plural possessive.
The singular possessive form of "classmate" is "classmate's."
Taco's is the singular possessive.
The singular possessive of dish is dish's
The singular possessive is Martin's.
Buzz's is the singular possessive.
The singular possessive is fish's.
Grave's is the singular possessive.