Question

1. I couldn’t get into the house because I forgot the key in the classroom.
-> if I
2. He does not understand Portuguese. He won’t work in Brazil.
-> if he
3. If the baby had slept better last night, I wouldn’t have been so tired.
-> had

Answer 1

Explanation:

if I had the key I would have go to the house

if he understand Portuguese he would have work in Brazil