I could waltz you could waltz he could waltz we could waltz you could waltz they could waltz
V-ing form
I could be waltzing you could be waltzing he could be waltzing we could be waltzing you could be waltzing they could be waltzing
Perfect
I could have waltzed you could have waltzed he could have waltzed we could have waltzed you could have waltzed they could have waltzed
V-ing perfect
I could have been waltzing you could have been waltzing he could have been waltzing we could have been waltzing you could have been waltzing they could have been waltzing
Negation
Simple form
I couldn't waltz you couldn't waltz he couldn't waltz we couldn't waltz you couldn't waltz they couldn't waltz
V-ing form
I couldn't be waltzing you couldn't be waltzing he couldn't be waltzing we couldn't be waltzing you couldn't be waltzing they couldn't be waltzing
Perfect
I couldn't have waltzed you couldn't have waltzed he couldn't have waltzed we couldn't have waltzed you couldn't have waltzed they couldn't have waltzed
V-ing perfect
I couldn't have been waltzing you couldn't have been waltzing he couldn't have been waltzing we couldn't have been waltzing you couldn't have been waltzing they couldn't have been waltzing
Interrogative form
Simple form
could I waltz? could you waltz? could he waltz? could we waltz? could you waltz? could they waltz?
V-ing form
could I be waltzing? could you be waltzing? could he be waltzing? could we be waltzing? could you be waltzing? could they be waltzing?
Perfect
could I have waltzed? could you have waltzed? could he have waltzed? could we have waltzed? could you have waltzed? could they have waltzed?
V-ing perfect
could I have been waltzing? could you have been waltzing? could he have been waltzing? could we have been waltzing? could you have been waltzing? could they have been waltzing?
Interro-negative form
Simple form
couldn't I waltz? couldn't you waltz? couldn't he waltz? couldn't we waltz? couldn't you waltz? couldn't they waltz?
V-ing form
couldn't I be waltzing? couldn't you be waltzing? couldn't he be waltzing? couldn't we be waltzing? couldn't you be waltzing? couldn't they be waltzing?
Perfect
couldn't I have waltzed? couldn't you have waltzed? couldn't he have waltzed? couldn't we have waltzed? couldn't you have waltzed? couldn't they have waltzed?
V-ing perfect
couldn't I have been waltzing? couldn't you have been waltzing? couldn't he have been waltzing? couldn't we have been waltzing? couldn't you have been waltzing? couldn't they have been waltzing?