I could canton you could canton he could canton we could canton you could canton they could canton
V-ing form
I could be cantoning you could be cantoning he could be cantoning we could be cantoning you could be cantoning they could be cantoning
Perfect
I could have cantoned you could have cantoned he could have cantoned we could have cantoned you could have cantoned they could have cantoned
V-ing perfect
I could have been cantoning you could have been cantoning he could have been cantoning we could have been cantoning you could have been cantoning they could have been cantoning
Negation
Simple form
I could not canton you could not canton he could not canton we could not canton you could not canton they could not canton
V-ing form
I could not be cantoning you could not be cantoning he could not be cantoning we could not be cantoning you could not be cantoning they could not be cantoning
Perfect
I could not have cantoned you could not have cantoned he could not have cantoned we could not have cantoned you could not have cantoned they could not have cantoned
V-ing perfect
I could not have been cantoning you could not have been cantoning he could not have been cantoning we could not have been cantoning you could not have been cantoning they could not have been cantoning
Interrogative form
Simple form
could I canton? could you canton? could he canton? could we canton? could you canton? could they canton?
V-ing form
could I be cantoning? could you be cantoning? could he be cantoning? could we be cantoning? could you be cantoning? could they be cantoning?
Perfect
could I have cantoned? could you have cantoned? could he have cantoned? could we have cantoned? could you have cantoned? could they have cantoned?
V-ing perfect
could I have been cantoning? could you have been cantoning? could he have been cantoning? could we have been cantoning? could you have been cantoning? could they have been cantoning?
Interro-negative form
Simple form
could I not canton? could you not canton? could he not canton? could we not canton? could you not canton? could they not canton?
V-ing form
could I not be cantoning? could you not be cantoning? could he not be cantoning? could we not be cantoning? could you not be cantoning? could they not be cantoning?
Perfect
could I not have cantoned? could you not have cantoned? could he not have cantoned? could we not have cantoned? could you not have cantoned? could they not have cantoned?
V-ing perfect
could I not have been cantoning? could you not have been cantoning? could he not have been cantoning? could we not have been cantoning? could you not have been cantoning? could they not have been cantoning?