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 couldn't cane you couldn't cane he couldn't cane we couldn't cane you couldn't cane they couldn't cane
V-ing form
I couldn't be caning you couldn't be caning he couldn't be caning we couldn't be caning you couldn't be caning they couldn't be caning
Perfect
I couldn't have caned you couldn't have caned he couldn't have caned we couldn't have caned you couldn't have caned they couldn't have caned
V-ing perfect
I couldn't have been caning you couldn't have been caning he couldn't have been caning we couldn't have been caning you couldn't have been caning they couldn't 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
couldn't I cane? couldn't you cane? couldn't he cane? couldn't we cane? couldn't you cane? couldn't they cane?
V-ing form
couldn't I be caning? couldn't you be caning? couldn't he be caning? couldn't we be caning? couldn't you be caning? couldn't they be caning?
Perfect
couldn't I have caned? couldn't you have caned? couldn't he have caned? couldn't we have caned? couldn't you have caned? couldn't they have caned?
V-ing perfect
couldn't I have been caning? couldn't you have been caning? couldn't he have been caning? couldn't we have been caning? couldn't you have been caning? couldn't they have been caning?