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 couldn't stun you couldn't stun he couldn't stun we couldn't stun you couldn't stun they couldn't stun
V-ing form
I couldn't be stunning you couldn't be stunning he couldn't be stunning we couldn't be stunning you couldn't be stunning they couldn't be stunning
Perfect
I couldn't have stunned you couldn't have stunned he couldn't have stunned we couldn't have stunned you couldn't have stunned they couldn't have stunned
V-ing perfect
I couldn't have been stunning you couldn't have been stunning he couldn't have been stunning we couldn't have been stunning you couldn't have been stunning they couldn't 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
couldn't I stun? couldn't you stun? couldn't he stun? couldn't we stun? couldn't you stun? couldn't they stun?
V-ing form
couldn't I be stunning? couldn't you be stunning? couldn't he be stunning? couldn't we be stunning? couldn't you be stunning? couldn't they be stunning?
Perfect
couldn't I have stunned? couldn't you have stunned? couldn't he have stunned? couldn't we have stunned? couldn't you have stunned? couldn't they have stunned?
V-ing perfect
couldn't I have been stunning? couldn't you have been stunning? couldn't he have been stunning? couldn't we have been stunning? couldn't you have been stunning? couldn't they have been stunning?