The singular form for the plural noun witnesses is witness; the singular possessive is witness'.
Example: The witness' bag was snatched as she walked away.
The possessive singular form of "witness" is "witness's."
The possessive form of the singular noun judge is judge's.Example: The witness had the judge's complete attention.
The possessive witness's pertains to something associated with a singular witness. The possessive witnesses' pertains to association with more than one individual witness (witnesses). (The exception here is for the plural ending in 's', which allows omission of the additional possessive 's', for written clarity and ease of pronunciation. Note that the singular possessive is pronounced identically to the plural AND plural possessive.)
The singular possessive form is week's.
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:witness'Add an apostrophe s ('s) after the existing s at the end of the word: witness'sExamples:The witness' statement was added to the police report.The witness's statement was added to the police report.Note: If you are a student, use the form that is preferred by your teacher.Because you will add an S sound to form the possessive, most style guides recommend the apostrophe S rather than the apostrophe alone, especially for common nouns.
The singular possessive form is classmate's.
The plural possessive form of witness is witnesses'
The possessive form is Amos's.
The singular possessive form for the noun gypsy is gypsy's.
The singular possessive form for country is county's.
The singular form for the plural noun countries is country; the singular possessive form is country's.
singular possessive: boy'splural possessive: boys'