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el mío	los míos	la mía	las mías	mine
el tuyo	los tuyos	la tuya	las tuyas	yours
el suyo	los suyos	la suya	las suyas	yours, his, hers
el nuestro	los nuestros	la nuestra	las nuestras	ours
el vuestro	los vuestros	la vuestra	las vuestras	yours
el suyo	los suyos	la suya	las suyas	yours, theirs

Possessive pronouns agree in gender and number with the noun possessed.

Pedro tiene sus cartas, pero Ana no tiene las suyas.
Pedro has his cards, but Ana doesn't have hers.

The possessive pronoun forms may also be used as adjectives modifying a noun for emphasis, in direct address, and in exclamations.

¡Dios mío!/My God!
Algunas ideas suyas son buenas./Some ideas of his are good.

After the verb ser the article is usually omitted. When the article is used, it indicates emphasis.

Estos ejercicios son míos./These exercises are mine.

The definite articles el, la, los, las, are always used with the possessive pronouns, except after ser. They may be used after ser for emphasis.

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POSS. ADJECTIVE		POSS. PRONOUN
Es mi habitación	It's my room	Es mía / Es la mía	It's mine
Es su perro	It's his dog	Es suyo / Es el suyo	It's his
Es nuestra casa	It's our house	Es nuestra / Es la nuestra	It's ours
Son vuestras ideas	They're our ideas	Son vuestras / Son las vuestras	They're yours
Son tus ejercicios	They're your exercises	Son tuyos / Son los tuyos	They're yours