The possessive form of the singular noun fuse box is fuse box's.
Example: The fuse box's replacement is going to be expensive.
The singular possessive form is box's.
The possessive form of the singular noun box is box's.Example: The box's contents are a mystery.
The form toys' is the plural possessive form of the singular noun toy.Example: The toys' box is full to the brim.The possessive form of the singular noun toy is toy's.Example: The toy's action made the baby smile.
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
The singular possessive is Martin's.
The singular possessive is fish's.
Grave's is the singular possessive.
The singular possessive form of "test" is "test's".