1. She had three sons, and they were happy family.
(Is this a right sentence?)
2. One day she got a disease and stayed in bed. (Is it OK?)
3. What will you do 20 years later?
3-1. I will teach math at an academy.
3-2. I will be studying abroad.
3-3. I will start to do business.
3-4. I will be able to buy a new car.
(Are the answers all correct?)