Ответ:

1. Do I always try to finish tasks I have planned to do?
2. What do  I always try to do?
3. Do I always try to finish tasks I have planned to do or do everything spontaneously?
4. I always try to finish tasks I have planned to do, don't I?
5. Who always tries to finish tasks I have planned to do?

1. Am I going to study Spanish in the near future?
2. What am I going to study in the near future?
3. Am I going to study Spanish or Italian in the near future?
4. I'm going to study Spanish in the near future, aren't I?
5. Who is going to study Spanish in the near future?