Question

complete com o passado do verbo tô be. i ...............a teacher

Answer 1

passado:
I was a teacher.
presente:
I am a teacher.

Answer 2

 I'm a teacher ou I am a teacher -> presente
 I was a teacher -> passado


pois:

Presente:        I - am      
                  You - are       
         He/She/it  - is
   We/You/They - are

Passado:                 I - was
                           You - were
                    He/She/it - was
             We/You/They - were