Complete a forma correta do verbo be ( was or were )
a) He___ a doctor.
b) I___ a doctor.
c) They___ doctors.
d) You___ a doctor.
e) The bus___ green.
f) Bill and Susan___ doctors.

was no singular (i, you, he, she, it) were no plural (we, you, they)


A - Was
b - Was
c - Were 
d - Were
e - Was
f -  Were