I'll be dumbfounding you'll be dumbfounding he'll be dumbfounding we'll be dumbfounding you'll be dumbfounding they'll be dumbfounding
Future perfect
I'll have dumbfounded you'll have dumbfounded he'll have dumbfounded we'll have dumbfounded you'll have dumbfounded they'll have dumbfounded
Future perfect continuous
I'll have been dumbfounding you'll have been dumbfounding he'll have been dumbfounding we'll have been dumbfounding you'll have been dumbfounding they'll have been dumbfounding
I'd be dumbfounding you'd be dumbfounding he'd be dumbfounding we'd be dumbfounding you'd be dumbfounding they'd be dumbfounding
Past
I'd have dumbfounded you'd have dumbfounded he'd have dumbfounded we'd have dumbfounded you'd have dumbfounded they'd have dumbfounded
Past continuous
I'd have been dumbfounding you'd have been dumbfounding he'd have been dumbfounding we'd have been dumbfounding you'd have been dumbfounding they'd have been dumbfounding