What are the rules for using possessive pronouns in grammar syntax?

The rules for using possessive pronouns in grammar syntax are as follows:

1. Possessive pronouns are used to show ownership or possession of something. They replace nouns and function as adjectives.

2. Possessive pronouns do not require an apostrophe. They already indicate possession, so there is no need to add an apostrophe before the "s".

3. The most common possessive pronouns are: mine, yours, his, hers, its, ours, and theirs. These pronouns are used to show possession without referring to a specific noun.

4. Possessive pronouns can also be used before a noun to show ownership. In this case, they function as determiners. For example, "This is my book" or "Is that your car?"

5. It is important to match the possessive pronoun with the noun it is replacing. For example, "This is my pen" (singular) or "These are our pens" (plural).

6. Possessive pronouns can also be used to show possession in a sentence without a noun. For example, "The red car is mine" or "The blue one is hers."

7. Possessive pronouns can be used in combination with other pronouns to show joint possession. For example, "This is our house" or "These are their books."

8. Possessive pronouns do not change form for gender or number. They remain the same regardless of the noun they are replacing.

Overall, possessive pronouns are used to indicate ownership or possession in a sentence, and they follow specific rules in grammar syntax.