brevemente te coloco varios ejemplos: - es mejor que se lo digas (you'd better say it to him)= "SE" utilizado como objeto indirecto en sustitución de "le" - María se asustó mucho (María got really scared) = "SE" utilizado como pseudo-reflexivo; conjugación de "asustarse" -se robaron la pintura (the painting has been stolen) = "SE" forma pasiva; significado "alguien" ("se"= meaning somebody) -aquí sólo se habla español (here, you must only speak Spanish)= "SE" utilizado como impersonal (se= meaning people) Here you have some examples of hoy we use "se" in Spanish, and a brief explanation of it. If you are interested on going deeper in this matter, book one of my classes and I will gladly help you. have a excellent day :)