Mi
What is the point of adding an "s" at the end of a possessive adjective?
To agree with the noun it is describing
What is the difference between "tu" with accent mark and "tu" without accent mark?
With accent mark = you and without accent mark = your
Translate: Their apples are red.
Sus manzanas son rojas.
When should I use "nuestras"?
When the noun we are describing is feminine and plural.
What is the your (familiar, plural) commonly used in Spain called and where is the accent mark?
Vuestro (or any other ending) and there is not accent mark
Translate: Tiago's sister is my friend.
La hermana de Tiago es mi amiga.