Решение:
1. He will be 13 years old tomorrow.
— Interrogative: Will he be 13 years old tomorrow?
— Negative: He will not be 13 years old tomorrow.
2. I will be back home at 6 o’clock.
— Interrogative: Will I be back home at 6 o’clock?
— Negative: I will not be back home at 6 o’clock.
3. We will be at the library at that time.
— Interrogative: Will we be at the library at that time?
— Negative: We will not be at the library at that time.
4. They will be here at 3 o’clock.
— Interrogative: Will they be here at 3 o’clock?
— Negative: They will not be here at 3 o’clock.
5. They will be happy to see us.
— Interrogative: Will they be happy to see us?
— Negative: They will not be happy to see us.