Step 1

In Spanish, the verb ser (to be) is used to describe identity, or inherent qualities that include personality, physical appearance, relationships, religion, and profession.

Yo soy estudiante.
     I am a student.
Tú eres inteligente.
     You are smart.
Él es delgado.
     He is thin.
Ella es guapa.
     She is good looking.
Nosotros somos meseros.
     We are waiters.
Vosotros sois estudiantes.
     You all are students.
Ellos son meseros.
     They are waiters.
Ustedes son maestros.
     You all are teachers. (formal)

Note!
Ud. (usted) is a formal way of saying you
Uds. (ustedes) is a formal way of saying you all

Note!
Sometimes endings don't change, regardless if you are discussing masculine or feminine.
Él es inteligente.
 He is intelligent.
Ella es inteligente.
 She is intelligent.