ser+and+estar

Ser- To be soy somos eres sois es son You would use ser for: permanent descriptitions, to tell time and place, profession, possession, and family relationships. Examples:
 * 1) Jose es una persona tranquila pero hoy esta molesto.
 * 2) Joe is a calm person but today he is upset.
 * 3) Yo soy a tletico.
 * 4) I am athletic.

Estar- To Be estoy estamos estas estais esta estan You would use Estar for: non- permenant descriptions, location, and present progressive. Examples:
 * 1) E  stamos  en la clase de espanol.
 * 2) We were in spanish class
 * 3) El agua del río  está  muy caliente.
 * 4) The river's water is very warm.