I could regale you could regale he could regale we could regale you could regale they could regale
V-ing form
I could be regaling you could be regaling he could be regaling we could be regaling you could be regaling they could be regaling
Perfect
I could have regaled you could have regaled he could have regaled we could have regaled you could have regaled they could have regaled
V-ing perfect
I could have been regaling you could have been regaling he could have been regaling we could have been regaling you could have been regaling they could have been regaling
Negation
Simple form
I couldn't regale you couldn't regale he couldn't regale we couldn't regale you couldn't regale they couldn't regale
V-ing form
I couldn't be regaling you couldn't be regaling he couldn't be regaling we couldn't be regaling you couldn't be regaling they couldn't be regaling
Perfect
I couldn't have regaled you couldn't have regaled he couldn't have regaled we couldn't have regaled you couldn't have regaled they couldn't have regaled
V-ing perfect
I couldn't have been regaling you couldn't have been regaling he couldn't have been regaling we couldn't have been regaling you couldn't have been regaling they couldn't have been regaling
Interrogative form
Simple form
could I regale? could you regale? could he regale? could we regale? could you regale? could they regale?
V-ing form
could I be regaling? could you be regaling? could he be regaling? could we be regaling? could you be regaling? could they be regaling?
Perfect
could I have regaled? could you have regaled? could he have regaled? could we have regaled? could you have regaled? could they have regaled?
V-ing perfect
could I have been regaling? could you have been regaling? could he have been regaling? could we have been regaling? could you have been regaling? could they have been regaling?
Interro-negative form
Simple form
couldn't I regale? couldn't you regale? couldn't he regale? couldn't we regale? couldn't you regale? couldn't they regale?
V-ing form
couldn't I be regaling? couldn't you be regaling? couldn't he be regaling? couldn't we be regaling? couldn't you be regaling? couldn't they be regaling?
Perfect
couldn't I have regaled? couldn't you have regaled? couldn't he have regaled? couldn't we have regaled? couldn't you have regaled? couldn't they have regaled?
V-ing perfect
couldn't I have been regaling? couldn't you have been regaling? couldn't he have been regaling? couldn't we have been regaling? couldn't you have been regaling? couldn't they have been regaling?