Weegy: When we want to show that something belongs to somebody or something, we usually add 's to a singular noun and an apostrophe ' to a plural noun, for example: The boy's ball (1 boy) or The boys' ball. (2 or more boys) User: A clause used as the object of a preposition is called a(n) Weegy: When we want to show that something belongs to somebody or something, we usually add 's to a singular noun and an apostrophe ' to a plural noun, for example: The boy's ball (1 boy) or The boys' ball. (2 or more boys). [ Who would not be a form of possessive. ] User: A clause used as the object of a preposition is called a(n) (More)