Subject pronoun and the verb "ser"

yo

yo

I

tú

you

él

he

ella

she

Usted (abbreviation = Ud.)

you formal

nosotros

we

vosotros

you all (Spain)

ellos

they (boys or boys & girls)

ellas

they (girls)

Ustedes (abbreviation = Uds.)

you all

yo soy

I am

tú eres

you are

él es

he is

ella es

she is

Usted es

You (formal) are

nosotros somos

We are

vosotros sois

You all are (Spain)

ellos son

They (boys, boys/girls) are

ellas son

They (girls) are

Ustedes son

You all are