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 couldn't trample you couldn't trample he couldn't trample we couldn't trample you couldn't trample they couldn't trample
V-ing form
I couldn't be trampling you couldn't be trampling he couldn't be trampling we couldn't be trampling you couldn't be trampling they couldn't be trampling
Perfect
I couldn't have trampled you couldn't have trampled he couldn't have trampled we couldn't have trampled you couldn't have trampled they couldn't have trampled
V-ing perfect
I couldn't have been trampling you couldn't have been trampling he couldn't have been trampling we couldn't have been trampling you couldn't have been trampling they couldn't 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
couldn't I trample? couldn't you trample? couldn't he trample? couldn't we trample? couldn't you trample? couldn't they trample?
V-ing form
couldn't I be trampling? couldn't you be trampling? couldn't he be trampling? couldn't we be trampling? couldn't you be trampling? couldn't they be trampling?
Perfect
couldn't I have trampled? couldn't you have trampled? couldn't he have trampled? couldn't we have trampled? couldn't you have trampled? couldn't they have trampled?
V-ing perfect
couldn't I have been trampling? couldn't you have been trampling? couldn't he have been trampling? couldn't we have been trampling? couldn't you have been trampling? couldn't they have been trampling?