The possessive form for the noun thermos is thermos's.
Example: I can't find the thermos's cap.
The singular possessive form is heart's; the plural possessive form is hearts'.
"Thermos is a brand name (adjective) not a noun. Brand names are always used as an adjective so the correct usage in a sentence would be "I bought ten Thermos containers." or "The Thermos food containers are on sale at the store this week."
The possessive form is subsidiary's.
The possessive form of "synopsis" is "synopsis's" or "synopsis'."
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 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 of "he" is "his": He did his homework after dinner.
The possessive form is posse's.
The possessive form for "lawyer" is "lawyer's."