I could stun you could stun he could stun we could stun you could stun they could stun
V-ing form
I could be stunning you could be stunning he could be stunning we could be stunning you could be stunning they could be stunning
Perfect
I could have stunned you could have stunned he could have stunned we could have stunned you could have stunned they could have stunned
V-ing perfect
I could have been stunning you could have been stunning he could have been stunning we could have been stunning you could have been stunning they could have been stunning
Negation
Simple form
I could not stun you could not stun he could not stun we could not stun you could not stun they could not stun
V-ing form
I could not be stunning you could not be stunning he could not be stunning we could not be stunning you could not be stunning they could not be stunning
Perfect
I could not have stunned you could not have stunned he could not have stunned we could not have stunned you could not have stunned they could not have stunned
V-ing perfect
I could not have been stunning you could not have been stunning he could not have been stunning we could not have been stunning you could not have been stunning they could not have been stunning
Interrogative form
Simple form
could I stun? could you stun? could he stun? could we stun? could you stun? could they stun?
V-ing form
could I be stunning? could you be stunning? could he be stunning? could we be stunning? could you be stunning? could they be stunning?
Perfect
could I have stunned? could you have stunned? could he have stunned? could we have stunned? could you have stunned? could they have stunned?
V-ing perfect
could I have been stunning? could you have been stunning? could he have been stunning? could we have been stunning? could you have been stunning? could they have been stunning?
Interro-negative form
Simple form
could I not stun? could you not stun? could he not stun? could we not stun? could you not stun? could they not stun?
V-ing form
could I not be stunning? could you not be stunning? could he not be stunning? could we not be stunning? could you not be stunning? could they not be stunning?
Perfect
could I not have stunned? could you not have stunned? could he not have stunned? could we not have stunned? could you not have stunned? could they not have stunned?
V-ing perfect
could I not have been stunning? could you not have been stunning? could he not have been stunning? could we not have been stunning? could you not have been stunning? could they not have been stunning?