Past Tense estar (preterite)

What is the correct preterite form of "estar" for "yo"?

Complete: "Nosotros _ en la playa ayer." (We were at the beach yesterday)

Which is the correct form for "ella"?

"Tú _ en la fiesta anoche." (You were at the party last night)

Complete: "Ellos _ contentos con el resultado." (They were happy with the result)

What is the correct form for "ustedes"?

"Juan y María _ en el concierto." (Juan and María were at the concert)

Which form completes: "Yo _ enfermo la semana pasada." (I was sick last week)

"Usted _ muy ocupado ayer." (You (formal) were very busy yesterday)

Complete: "Mi hermana _ en casa todo el día." (My sister was home all day)