Answer:
future continues- they will be learning their lessons.
future perfect- they will have learning their lessons.
future perfect continues- they will have been learning their lessons.
It is about Gordon korman using the item as the next future item in the case of the continuing investigation. The protagonist says the character of the secretary is the only territory of the England in the northwest. Therefore the protagonist is saying that Gordon is using the future time telling as the next best item. Good luck :)
Explanation:
while, both, only one, however