Actions completed before a specific time: I will have finished my degree by 2029.
Actions completed before another future action: The train will have left before we even get to the station.
Conviction about the near past: The guests will have arrived by now; I should head home.
Future Continuous & Perfect Rules (British Council)
Future Perfect 1 (Perfect English Grammar)
Future Perfect Quiz (English Club)
Future Continuous Activities (Literacy Services)
Future Continuous Vs. Perfect 1 (WordWall)
Future Continuous Vs. Perfect 2 (Oxford)
Future Continuous Vs. Perfect (Speaking, WordWall)
Shot in the dark, pdf (Teach This)