My, your, his, her etc are possessive adjectives. They are used with nouns. In Spanish they are as follows:
| Subject Pronouns | English possessive adj | Masc singular | Fem singular | Masc plural | Fem plural |
| TO | MY | Mi | Mi | Mis | Mis |
| TU | YOUR | Tu | Tu | Tus | Tus |
| EL,ELLA,USTED | HIS,HER,YOUR | Su | Su | Sus | Sus |
| NOSOTROS | OUR | Nuestro | Nuestra | Nuestros | Nuestras |
| VOSOTROS | YOUR | Vuestro | Vuestra | Vuestros | Vuestras |
| ELLOS,ELLAS,USTEDES | THEIR,YOUR | Su | Su | Sus | Sus |
Since they are adjectives, they agree with the noun they describe.