I could trample you could trample he could trample we could trample you could trample they could trample
V-ing form
I could be trampling you could be trampling he could be trampling we could be trampling you could be trampling they could be trampling
Perfect
I could have trampled you could have trampled he could have trampled we could have trampled you could have trampled they could have trampled
V-ing perfect
I could have been trampling you could have been trampling he could have been trampling we could have been trampling you could have been trampling they could have been trampling
Negation
Simple form
I could not trample you could not trample he could not trample we could not trample you could not trample they could not trample
V-ing form
I could not be trampling you could not be trampling he could not be trampling we could not be trampling you could not be trampling they could not be trampling
Perfect
I could not have trampled you could not have trampled he could not have trampled we could not have trampled you could not have trampled they could not have trampled
V-ing perfect
I could not have been trampling you could not have been trampling he could not have been trampling we could not have been trampling you could not have been trampling they could not have been trampling
Interrogative form
Simple form
could I trample? could you trample? could he trample? could we trample? could you trample? could they trample?
V-ing form
could I be trampling? could you be trampling? could he be trampling? could we be trampling? could you be trampling? could they be trampling?
Perfect
could I have trampled? could you have trampled? could he have trampled? could we have trampled? could you have trampled? could they have trampled?
V-ing perfect
could I have been trampling? could you have been trampling? could he have been trampling? could we have been trampling? could you have been trampling? could they have been trampling?
Interro-negative form
Simple form
could I not trample? could you not trample? could he not trample? could we not trample? could you not trample? could they not trample?
V-ing form
could I not be trampling? could you not be trampling? could he not be trampling? could we not be trampling? could you not be trampling? could they not be trampling?
Perfect
could I not have trampled? could you not have trampled? could he not have trampled? could we not have trampled? could you not have trampled? could they not have trampled?
V-ing perfect
could I not have been trampling? could you not have been trampling? could he not have been trampling? could we not have been trampling? could you not have been trampling? could they not have been trampling?