Pattern :
+ S + Will + Have + Been + V1 (ing)
- S + Will + Not + Have + Been + V1 (ing)
? Will + S + Have + Been + V1 (ing)
Ex :
+ We will have been studying for two hours by the time you arrive
- We will not have been studying foir two hours by the time you arrive
? Will we have been studying for two hours by the time you arrive
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