Possessive adjectives in Spanish
Notes:
Possessive adjectives indicate ownership or relation with something: My, your, his… For example: Mi taza, my cup. When you add any other feature of the object it will agree in number and gender.
Examples
Femenine / Masculine nouns: Mi taza es blanca / Mi telefono es negro
Singular / Plural nouns: Mi taza es blanca / Mis tazas son blancas
More on gender and number agreement in Spanish in this video podcast: http://www.youtube.com/watch?v=QV-xib2YePo&list=UUCvBPtORas4iBk3N2rUSTjg