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 couldn't wan you couldn't wan he couldn't wan we couldn't wan you couldn't wan they couldn't wan
V-ing form
I couldn't be waning you couldn't be waning he couldn't be waning we couldn't be waning you couldn't be waning they couldn't be waning
Perfect
I couldn't have waned you couldn't have waned he couldn't have waned we couldn't have waned you couldn't have waned they couldn't have waned
V-ing perfect
I couldn't have been waning you couldn't have been waning he couldn't have been waning we couldn't have been waning you couldn't have been waning they couldn't 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
couldn't I wan? couldn't you wan? couldn't he wan? couldn't we wan? couldn't you wan? couldn't they wan?
V-ing form
couldn't I be waning? couldn't you be waning? couldn't he be waning? couldn't we be waning? couldn't you be waning? couldn't they be waning?
Perfect
couldn't I have waned? couldn't you have waned? couldn't he have waned? couldn't we have waned? couldn't you have waned? couldn't they have waned?
V-ing perfect
couldn't I have been waning? couldn't you have been waning? couldn't he have been waning? couldn't we have been waning? couldn't you have been waning? couldn't they have been waning?