Ser
to be- Permanent
Estar
to be- Temporary
Yo soy viejo.
I am old.
Tú eres joven.
You are young
él es de Cuba.
He is from Cuba.
Ella es profesora.
She is teacher.
Ud. es de los Estados Unidos.
You (formal, singular) are from the United States.
Nosotros somos amigos
We are friends.
Ellos son simpáticos
They are nice
Uds. son estudiantes.
You (formal, plural) are students.
Yo estoy alegre.
I am happy.
Tú estás bien hoy.
You are well today.
Ella está en casa.
She is at home.
Nosotros estamos cansados.
We are tired.
Ellos están enfermos.
They are sick.