I could draw you could draw she could draw we could draw you could draw they could draw
V-ing form
I could be drawing you could be drawing she could be drawing we could be drawing you could be drawing they could be drawing
Perfect
I could have drawn you could have drawn she could have drawn we could have drawn you could have drawn they could have drawn
V-ing perfect
I could have been drawing you could have been drawing she could have been drawing we could have been drawing you could have been drawing they could have been drawing
Negation
Simple form
I couldn't draw you couldn't draw she couldn't draw we couldn't draw you couldn't draw they couldn't draw
V-ing form
I couldn't be drawing you couldn't be drawing she couldn't be drawing we couldn't be drawing you couldn't be drawing they couldn't be drawing
Perfect
I couldn't have drawn you couldn't have drawn she couldn't have drawn we couldn't have drawn you couldn't have drawn they couldn't have drawn
V-ing perfect
I couldn't have been drawing you couldn't have been drawing she couldn't have been drawing we couldn't have been drawing you couldn't have been drawing they couldn't have been drawing
Interrogative form
Simple form
could I draw? could you draw? could she draw? could we draw? could you draw? could they draw?
V-ing form
could I be drawing? could you be drawing? could she be drawing? could we be drawing? could you be drawing? could they be drawing?
Perfect
could I have drawn? could you have drawn? could she have drawn? could we have drawn? could you have drawn? could they have drawn?
V-ing perfect
could I have been drawing? could you have been drawing? could she have been drawing? could we have been drawing? could you have been drawing? could they have been drawing?
Interro-negative form
Simple form
couldn't I draw? couldn't you draw? couldn't she draw? couldn't we draw? couldn't you draw? couldn't they draw?
V-ing form
couldn't I be drawing? couldn't you be drawing? couldn't she be drawing? couldn't we be drawing? couldn't you be drawing? couldn't they be drawing?
Perfect
couldn't I have drawn? couldn't you have drawn? couldn't she have drawn? couldn't we have drawn? couldn't you have drawn? couldn't they have drawn?
V-ing perfect
couldn't I have been drawing? couldn't you have been drawing? couldn't she have been drawing? couldn't we have been drawing? couldn't you have been drawing? couldn't they have been drawing?