The form hippopotamus's is a correct possessive form of the singular noun hippopotamus.
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: hippopotamus'
Add an apostrophe s ('s) after the existing s at the end of the word: hippopotamus's
When a word ends in an S, you don't add another S to make it possessive. You simply add the apostrophe to make HIPPOPOTAMUS'
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'."
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 lawyer's.
The possessive form of "he" is "his": He did his homework after dinner.
The possessive form is posse's.
The possessive form is battleship's.
Bicyclist's is the possessive form.
The possessive form is librarian's.