Future Perfect Tense in English Grammar
d) Interrogatives-cum-W/H-words in Future Perfect Tense in English Grammar
W/H-Word → Shall/Will → Subject → Have → 3rd form of Verb (V3) → Object.
Why shall we have cooked meal?
When shall I have stopped the car by applying brakes?
How will they have finished their work?
Will she have displayed her pictures?