I could skewer you could skewer he could skewer we could skewer you could skewer they could skewer
V-ing form
I could be skewering you could be skewering he could be skewering we could be skewering you could be skewering they could be skewering
Perfect
I could have skewered you could have skewered he could have skewered we could have skewered you could have skewered they could have skewered
V-ing perfect
I could have been skewering you could have been skewering he could have been skewering we could have been skewering you could have been skewering they could have been skewering
Negation
Simple form
I could not skewer you could not skewer he could not skewer we could not skewer you could not skewer they could not skewer
V-ing form
I could not be skewering you could not be skewering he could not be skewering we could not be skewering you could not be skewering they could not be skewering
Perfect
I could not have skewered you could not have skewered he could not have skewered we could not have skewered you could not have skewered they could not have skewered
V-ing perfect
I could not have been skewering you could not have been skewering he could not have been skewering we could not have been skewering you could not have been skewering they could not have been skewering
Interrogative form
Simple form
could I skewer? could you skewer? could he skewer? could we skewer? could you skewer? could they skewer?
V-ing form
could I be skewering? could you be skewering? could he be skewering? could we be skewering? could you be skewering? could they be skewering?
Perfect
could I have skewered? could you have skewered? could he have skewered? could we have skewered? could you have skewered? could they have skewered?
V-ing perfect
could I have been skewering? could you have been skewering? could he have been skewering? could we have been skewering? could you have been skewering? could they have been skewering?
Interro-negative form
Simple form
could I not skewer? could you not skewer? could he not skewer? could we not skewer? could you not skewer? could they not skewer?
V-ing form
could I not be skewering? could you not be skewering? could he not be skewering? could we not be skewering? could you not be skewering? could they not be skewering?
Perfect
could I not have skewered? could you not have skewered? could he not have skewered? could we not have skewered? could you not have skewered? could they not have skewered?
V-ing perfect
could I not have been skewering? could you not have been skewering? could he not have been skewering? could we not have been skewering? could you not have been skewering? could they not have been skewering?