I could cane you could cane he could cane we could cane you could cane they could cane
V-ing form
I could be caning you could be caning he could be caning we could be caning you could be caning they could be caning
Perfect
I could have caned you could have caned he could have caned we could have caned you could have caned they could have caned
V-ing perfect
I could have been caning you could have been caning he could have been caning we could have been caning you could have been caning they could have been caning
Negation
Simple form
I could not cane you could not cane he could not cane we could not cane you could not cane they could not cane
V-ing form
I could not be caning you could not be caning he could not be caning we could not be caning you could not be caning they could not be caning
Perfect
I could not have caned you could not have caned he could not have caned we could not have caned you could not have caned they could not have caned
V-ing perfect
I could not have been caning you could not have been caning he could not have been caning we could not have been caning you could not have been caning they could not have been caning
Interrogative form
Simple form
could I cane? could you cane? could he cane? could we cane? could you cane? could they cane?
V-ing form
could I be caning? could you be caning? could he be caning? could we be caning? could you be caning? could they be caning?
Perfect
could I have caned? could you have caned? could he have caned? could we have caned? could you have caned? could they have caned?
V-ing perfect
could I have been caning? could you have been caning? could he have been caning? could we have been caning? could you have been caning? could they have been caning?
Interro-negative form
Simple form
could I not cane? could you not cane? could he not cane? could we not cane? could you not cane? could they not cane?
V-ing form
could I not be caning? could you not be caning? could he not be caning? could we not be caning? could you not be caning? could they not be caning?
Perfect
could I not have caned? could you not have caned? could he not have caned? could we not have caned? could you not have caned? could they not have caned?
V-ing perfect
could I not have been caning? could you not have been caning? could he not have been caning? could we not have been caning? could you not have been caning? could they not have been caning?