Aquí tienes las oraciones con el verbo "to be" utilizando cada pronombre:
1. I am happy.
2. You are tired.
3. She is a doctor.
4. He is a student.
5. It is a cat.
6. We are friends.
7. They are teachers.
Y aquí están las mismas oraciones en negativo:
1. I am not happy.
2. You are not tired.
3. She is not a doctor.
4. He is not a student.
5. It is not a cat.
6. We are not friends.
7. They are not teachers.