I could wave you could wave she could wave we could wave you could wave they could wave
V-ing form
I could be waving you could be waving she could be waving we could be waving you could be waving they could be waving
Perfect
I could have waved you could have waved she could have waved we could have waved you could have waved they could have waved
V-ing perfect
I could have been waving you could have been waving she could have been waving we could have been waving you could have been waving they could have been waving
Negation
Simple form
I could not wave you could not wave she could not wave we could not wave you could not wave they could not wave
V-ing form
I could not be waving you could not be waving she could not be waving we could not be waving you could not be waving they could not be waving
Perfect
I could not have waved you could not have waved she could not have waved we could not have waved you could not have waved they could not have waved
V-ing perfect
I could not have been waving you could not have been waving she could not have been waving we could not have been waving you could not have been waving they could not have been waving
Interrogative form
Simple form
could I wave? could you wave? could she wave? could we wave? could you wave? could they wave?
V-ing form
could I be waving? could you be waving? could she be waving? could we be waving? could you be waving? could they be waving?
Perfect
could I have waved? could you have waved? could she have waved? could we have waved? could you have waved? could they have waved?
V-ing perfect
could I have been waving? could you have been waving? could she have been waving? could we have been waving? could you have been waving? could they have been waving?
Interro-negative form
Simple form
could I not wave? could you not wave? could she not wave? could we not wave? could you not wave? could they not wave?
V-ing form
could I not be waving? could you not be waving? could she not be waving? could we not be waving? could you not be waving? could they not be waving?
Perfect
could I not have waved? could you not have waved? could she not have waved? could we not have waved? could you not have waved? could they not have waved?
V-ing perfect
could I not have been waving? could you not have been waving? could she not have been waving? could we not have been waving? could you not have been waving? could they not have been waving?