I could whack you could whack he could whack we could whack you could whack they could whack
V-ing form
I could be whacking you could be whacking he could be whacking we could be whacking you could be whacking they could be whacking
Perfect
I could have whacked you could have whacked he could have whacked we could have whacked you could have whacked they could have whacked
V-ing perfect
I could have been whacking you could have been whacking he could have been whacking we could have been whacking you could have been whacking they could have been whacking
Negation
Simple form
I could not whack you could not whack he could not whack we could not whack you could not whack they could not whack
V-ing form
I could not be whacking you could not be whacking he could not be whacking we could not be whacking you could not be whacking they could not be whacking
Perfect
I could not have whacked you could not have whacked he could not have whacked we could not have whacked you could not have whacked they could not have whacked
V-ing perfect
I could not have been whacking you could not have been whacking he could not have been whacking we could not have been whacking you could not have been whacking they could not have been whacking
Interrogative form
Simple form
could I whack? could you whack? could he whack? could we whack? could you whack? could they whack?
V-ing form
could I be whacking? could you be whacking? could he be whacking? could we be whacking? could you be whacking? could they be whacking?
Perfect
could I have whacked? could you have whacked? could he have whacked? could we have whacked? could you have whacked? could they have whacked?
V-ing perfect
could I have been whacking? could you have been whacking? could he have been whacking? could we have been whacking? could you have been whacking? could they have been whacking?
Interro-negative form
Simple form
could I not whack? could you not whack? could he not whack? could we not whack? could you not whack? could they not whack?
V-ing form
could I not be whacking? could you not be whacking? could he not be whacking? could we not be whacking? could you not be whacking? could they not be whacking?
Perfect
could I not have whacked? could you not have whacked? could he not have whacked? could we not have whacked? could you not have whacked? could they not have whacked?
V-ing perfect
could I not have been whacking? could you not have been whacking? could he not have been whacking? could we not have been whacking? could you not have been whacking? could they not have been whacking?