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