Answer:
ESTABA
Yo estaba
El estaba
Ella estaba
Ellos estaban
Nosotros estabamos
I guess that's it, but I don't quite understand the context
Verbs can be said to have five forms in English: the base form, the present tense form (which may include the agreement ending -s), the past tense form, the present participle, and the past participle
La porristas estaban furiosos cuando su equipo perdió el juego is ¨The cheerleaders were furious when their team lost the game
ITS "ERES" THE 3RD ONE!!!