Completa los diálogos con la forma correcta del verbo to be.
1. A: Look! My classmates Maria and Teresa!
B: (1) ________ they Mexican?
A: No, they (2) _______. They (3) ________Peruvian.
2. A: That’s my friend Jerry.
B: (1) _______he a firefighter?
A: No, he (2) _______. Barry (3) _______ a firefighter. Jerry (4) ________ a police officer.
3. A: (1) ______you a new student?
B: Yes, I (2) ______. My name (3) ______Brian.
A: (4) ________you from Australia? B: No, I (5) _______. I (6) ________from the U.K.