What are the rules for forming possessive nouns with compound nouns ending in 's'?

What are the rules for forming possessive nouns with compound nouns ending in 's'?

When forming possessive nouns with compound nouns ending in 's', there are a few rules to follow.

1. If the compound noun is singular and ends in 's', add an apostrophe and an 's' to the end of the compound noun. For example, if we have the compound noun "boss's office," the possessive form would be "boss's office."

2. If the compound noun is plural and ends in 's', add only an apostrophe to the end of the compound noun. For example, if we have the compound noun "teachers' lounge," the possessive form would be "teachers' lounge."

3. If the compound noun is plural and does not end in 's', add an apostrophe and an 's' to the end of the compound noun. For example, if we have the compound noun "children's toys," the possessive form would be "children's toys."

4. If the compound noun is a proper noun (a specific name), follow the same rules as above. For example, if we have the compound noun "James's car," the possessive form would be "James's car."

It is important to note that these rules apply to compound nouns, which are nouns made up of two or more words that function as a single unit. By following these rules, we can correctly form possessive nouns with compound nouns ending in 's'.