Final answer:
The word 'yours' in the given sentence is a possessive pronoun indicating that the car will belong to the person addressed after they make their final payment. It is part of the possessive case, which shows ownership, as opposed to the subjective or objective cases of pronouns.
Step-by-step explanation:
The word "yours" in the sentence "The car will be yours when you pay your last car payment." is a possessive pronoun. This type of pronoun is used to indicate ownership or belonging. In this case, the possessive pronoun 'yours' is indicating that the car will belong to the person being addressed once they complete their payments.
It is essential to distinguish possessive pronouns from other forms. Unlike the contraction "you're," which stands for "you are," the word "yours" does not involve an apostrophe because it is the possessive form of "you." Similarly, when discussing possessive case pronouns, it is important to use them correctly before gerunds and in reference to their antecedents.
Pronouns come in different cases: subjective case, objective case, and possessive case. The subjective case is for subjects performing an action, the objective case is for objects receiving an action, and the possessive case indicates ownership, as seen in our example.