The plural form of the proper noun Martinez is Martinezes.
The plural possessive form is Martinezes'.
Example: The Martinezes' children are six and ten years of age.
The possessive form of the proper noun Martinez is Martinez's.
Example: Dr. Martinez's office is on the third floor.
The possessive form of "he" is "his": He did his homework after dinner.
No, it is singular, the possessive form of it is its. The plural form of it is they or them, and the possessive form is their.To answer the question directly: there is no such word as ITS'.
The singular possessive form is heart's; the plural possessive form is hearts'.
The possessive form is subsidiary's.
The possessive form of "synopsis" is "synopsis's" or "synopsis'."
The singular possessive is Richard's; the plural possessive is Richards'.
The possessive form is battleship's.
Bicyclist's is the possessive form.
The possessive form is librarian's.
The possessive form is posse's.
The possessive form for "lawyer" is "lawyer's."
The possessive form is whistle's.