Gerda P. answered 05/07/20
¡Sí se puede! Experienced Spanish Teacher HS, College, Adult
Hola!
#1 El plomero= the plumber which could be substituted as "he" --> él- which goes with es in verb ser. Therefore #1 is incorrect.
#2 La tía= the aunt which can be substituted as "she"--> ella- which corresponds with es in verb ser conjugation. Therefore #2 is incorrect.
#3 Correct! El bombero= the firefighter- which could be substituted as "he" --> él- which goes with es in verb ser.
#4 Incorrect- Yo= I - which always travels with soy in the verb Ser.
Best of luck! Buena suerte.