What are the rules for using determiners with possessive pronouns?

The rules for using determiners with possessive pronouns are as follows:

1. Determiners are not used with possessive pronouns. Possessive pronouns already indicate ownership or possession, so there is no need to use a determiner before them.

For example:
- Incorrect: My his car is parked outside.
- Correct: His car is parked outside.

2. However, determiners can be used with possessive nouns. Possessive nouns are nouns that show ownership or possession and are formed by adding an apostrophe and an "s" ('s) to the noun.

For example:
- Incorrect: Their's house is beautiful.
- Correct: Their house is beautiful.

3. When using a possessive pronoun as a determiner before a noun, the possessive pronoun should agree in number and gender with the noun it modifies.

For example:
- Incorrect: Her books are on the shelf.
- Correct: Her book is on the shelf.

4. In some cases, a possessive pronoun can be used alone without a noun, indicating ownership or possession.

For example:
- Incorrect: The book is mine's.
- Correct: The book is mine.

Overall, it is important to remember that possessive pronouns already indicate ownership or possession, so determiners are not necessary when using them. However, determiners can be used with possessive nouns and should agree in number and gender with the noun they modify.