I could regale you could regale she could regale we could regale you could regale they could regale
V-ing form
I could be regaling you could be regaling she could be regaling we could be regaling you could be regaling they could be regaling
Perfect
I could have regaled you could have regaled she 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 she 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 she 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 she 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 she 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 she 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 she regale? could we regale? could you regale? could they regale?
V-ing form
could I be regaling? could you be regaling? could she be regaling? could we be regaling? could you be regaling? could they be regaling?
Perfect
could I have regaled? could you have regaled? could she 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 she 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 she 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 she 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 she 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 she have been regaling? couldn't we have been regaling? couldn't you have been regaling? couldn't they have been regaling?