To be =
Ser
Tú eres =
You are
Usted es =
You are (formal)
Él es =
He is
Ella es =
She is
Nosotros somos =
We are
Vosotros sois =
You all are (familiar) (in Spain)
Ustedes son =
You all are
Ellos son =
They are (masculine/mixed)
Ellas son =
They are (feminine)
Yo soy =
I am