The form churches is the plural of the noun "church."
example: There are three churches on this street.
The form church's is the singular possessive noun.
example: There was a special request for donations to repair the church's roof.
The plural form of the noun church is churches.
It is church.
churchs
Muslims call their churches "Mosques"
Quantum is singular, not singular possessive. The singular possessive form is quantum's.
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 pronouns are "my," "mine," "your," "yours," "his," "her," and "its."
The singular possessive of dish is dish's
Grave's is the singular possessive.
The singular possessive form of "test" is "test's".
The singular possessive is Martin's.
The singular possessive is fish's.
Buzz's is the singular possessive.