I could bend you could bend he could bend we could bend you could bend they could bend
V-ing form
I could be bending you could be bending he could be bending we could be bending you could be bending they could be bending
Perfect
I could have bent you could have bent he could have bent we could have bent you could have bent they could have bent
V-ing perfect
I could have been bending you could have been bending he could have been bending we could have been bending you could have been bending they could have been bending
Negation
Simple form
I could not bend you could not bend he could not bend we could not bend you could not bend they could not bend
V-ing form
I could not be bending you could not be bending he could not be bending we could not be bending you could not be bending they could not be bending
Perfect
I could not have bent you could not have bent he could not have bent we could not have bent you could not have bent they could not have bent
V-ing perfect
I could not have been bending you could not have been bending he could not have been bending we could not have been bending you could not have been bending they could not have been bending
Interrogative form
Simple form
could I bend? could you bend? could he bend? could we bend? could you bend? could they bend?
V-ing form
could I be bending? could you be bending? could he be bending? could we be bending? could you be bending? could they be bending?
Perfect
could I have bent? could you have bent? could he have bent? could we have bent? could you have bent? could they have bent?
V-ing perfect
could I have been bending? could you have been bending? could he have been bending? could we have been bending? could you have been bending? could they have been bending?
Interro-negative form
Simple form
could I not bend? could you not bend? could he not bend? could we not bend? could you not bend? could they not bend?
V-ing form
could I not be bending? could you not be bending? could he not be bending? could we not be bending? could you not be bending? could they not be bending?
Perfect
could I not have bent? could you not have bent? could he not have bent? could we not have bent? could you not have bent? could they not have bent?
V-ing perfect
could I not have been bending? could you not have been bending? could he not have been bending? could we not have been bending? could you not have been bending? could they not have been bending?