Ser vs estar
I'm confused, both mean ''to be'', but whe do you use one over the other?
Ser used to describe objects, people, ideas, etc. You generally you use it describe things that are permanent. Such as, "Eres inteligente." - You are intelligent. Use estar when you want to describe how someone might feel at a particular moment or where someone is located. For example, "Estoy cansado" - I am tired or "Estoy en mi casa." - I am in my house. There are exceptions of course. The only one I know is when talking about death. For example, "He is dead," would translate to "El esta muerto," even though death is very permanent.
You may want to read this: http://www.studyspanish.com/lessons/serest1.htm
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