I could wan you could wan he could wan we could wan you could wan they could wan
V-ing form
I could be waning you could be waning he could be waning we could be waning you could be waning they could be waning
Perfect
I could have waned you could have waned he could have waned we could have waned you could have waned they could have waned
V-ing perfect
I could have been waning you could have been waning he could have been waning we could have been waning you could have been waning they could have been waning
Negation
Simple form
I could not wan you could not wan he could not wan we could not wan you could not wan they could not wan
V-ing form
I could not be waning you could not be waning he could not be waning we could not be waning you could not be waning they could not be waning
Perfect
I could not have waned you could not have waned he could not have waned we could not have waned you could not have waned they could not have waned
V-ing perfect
I could not have been waning you could not have been waning he could not have been waning we could not have been waning you could not have been waning they could not have been waning
Interrogative form
Simple form
could I wan? could you wan? could he wan? could we wan? could you wan? could they wan?
V-ing form
could I be waning? could you be waning? could he be waning? could we be waning? could you be waning? could they be waning?
Perfect
could I have waned? could you have waned? could he have waned? could we have waned? could you have waned? could they have waned?
V-ing perfect
could I have been waning? could you have been waning? could he have been waning? could we have been waning? could you have been waning? could they have been waning?
Interro-negative form
Simple form
could I not wan? could you not wan? could he not wan? could we not wan? could you not wan? could they not wan?
V-ing form
could I not be waning? could you not be waning? could he not be waning? could we not be waning? could you not be waning? could they not be waning?
Perfect
could I not have waned? could you not have waned? could he not have waned? could we not have waned? could you not have waned? could they not have waned?
V-ing perfect
could I not have been waning? could you not have been waning? could he not have been waning? could we not have been waning? could you not have been waning? could they not have been waning?