Question

the fish will have been swimming into the river for two hours convert into interrogative​

Answer 1

Explanation:

(In other sentence types, the subject comes before the verb.) ... You will change the question into a statement, and then the subject will be staring you in the ... Have you been cooking?

Missing: fish ‎| Must include: fish

Answer 2

Answer:

Will the fish have been swimming into the river for two hours?

Hope this is helpful for you.