My, your, his etc are possessive adjectives in English. They are used with nouns and therefore need to agree. In Spanish, they are as follows:
| my | mi | mi |
| Your (sing / inf) | tu | tu |
| His / her / your (sing / for) | su | su |
| our | nuestro | nuestra |
| Your (pl / informal) | vuestro | vuestra |
| Their, your (pl / for) | su | su |
| my | mis | mis |
| Your (sing / inf) | tus | tus |
| His / her / your (sing / for) | sus | sus |
| our | nuestros | nuestras |
| Your (pl / informal) | vuestros | vuestras |
| Their, your (pl / for) | sus | sus |
Por ejemplo:
No tengo mi cuaderno
¿Cómo es tu casa?
Vuestras ías son simpáticas