I could landslide you could landslide he could landslide we could landslide you could landslide they could landslide
V-ing form
I could be landsliding you could be landsliding he could be landsliding we could be landsliding you could be landsliding they could be landsliding
Perfect
I could have landslid you could have landslid he could have landslid we could have landslid you could have landslid they could have landslid
V-ing perfect
I could have been landsliding you could have been landsliding he could have been landsliding we could have been landsliding you could have been landsliding they could have been landsliding
Negation
Simple form
I could not landslide you could not landslide he could not landslide we could not landslide you could not landslide they could not landslide
V-ing form
I could not be landsliding you could not be landsliding he could not be landsliding we could not be landsliding you could not be landsliding they could not be landsliding
Perfect
I could not have landslid you could not have landslid he could not have landslid we could not have landslid you could not have landslid they could not have landslid
V-ing perfect
I could not have been landsliding you could not have been landsliding he could not have been landsliding we could not have been landsliding you could not have been landsliding they could not have been landsliding
Interrogative form
Simple form
could I landslide? could you landslide? could he landslide? could we landslide? could you landslide? could they landslide?
V-ing form
could I be landsliding? could you be landsliding? could he be landsliding? could we be landsliding? could you be landsliding? could they be landsliding?
Perfect
could I have landslid? could you have landslid? could he have landslid? could we have landslid? could you have landslid? could they have landslid?
V-ing perfect
could I have been landsliding? could you have been landsliding? could he have been landsliding? could we have been landsliding? could you have been landsliding? could they have been landsliding?
Interro-negative form
Simple form
could I not landslide? could you not landslide? could he not landslide? could we not landslide? could you not landslide? could they not landslide?
V-ing form
could I not be landsliding? could you not be landsliding? could he not be landsliding? could we not be landsliding? could you not be landsliding? could they not be landsliding?
Perfect
could I not have landslid? could you not have landslid? could he not have landslid? could we not have landslid? could you not have landslid? could they not have landslid?
V-ing perfect
could I not have been landsliding? could you not have been landsliding? could he not have been landsliding? could we not have been landsliding? could you not have been landsliding? could they not have been landsliding?