I’m going to ___.
buy something, drive, study, go for a walk etc.
I will ___.
You don’t need to know that names of these tenses, you just have to know how to use them.
Future Continuous Tense
What will you be doing at 2:15?
I will be walking.
Future Perfect Continuous
You will have been walking for one hour.
Future Perfect Tense
You will have walked for one hour.