Anexo : Que va unido a otra cosa de la cual depende o con la que está muy relacionado.
Ser is used in a simple way, to talk about WHAT something is (permanent state). To describe characteristics that are an essential part of the thing we're talking about. Estar is used to talk about HOW something is, so we use it for conditions, locations, emotions, and actions (temporary states).
Anteayer era lunes. (i think it right)
Are you wanting to translate into English? If so, it's Eduardo hurts his elbow.
