Question

What's the difference between the Spanish infinitives (to be) ser and estar?

Answer 1

Estar is for how you feel and where you are, temporary things. ser is more for permanent characteristics like where you were born.

Answer 2

Ser is who you are. for example, "Yo soy mexicana." (I am mexican) which is to be something or someone. Estar is your state of action as in location . For example, "Yo estoy en la tienda" (I am at the store".