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