afirmativa: Sujeto + (verbo to be en pasado: WAS / WERE)
negativa: Sujeto + (verbo to be en pasado: WAS / WERE) + NOT
interrogativa: (verbo to be en pasado: WAS / WERE) + sujeto ?
I was --- I was not --- Was I ? (yo era o estaba)
You were --- you were not --- were you ?
He/she/it was --- he/she/it was not --- was he/she/it ?
we/you/they were --- we/you/they were not --- were we/you/they ?