I could hover you could hover he could hover we could hover you could hover they could hover
V-ing form
I could be hovering you could be hovering he could be hovering we could be hovering you could be hovering they could be hovering
Perfect
I could have hovered you could have hovered he could have hovered we could have hovered you could have hovered they could have hovered
V-ing perfect
I could have been hovering you could have been hovering he could have been hovering we could have been hovering you could have been hovering they could have been hovering
Negation
Simple form
I couldn't hover you couldn't hover he couldn't hover we couldn't hover you couldn't hover they couldn't hover
V-ing form
I couldn't be hovering you couldn't be hovering he couldn't be hovering we couldn't be hovering you couldn't be hovering they couldn't be hovering
Perfect
I couldn't have hovered you couldn't have hovered he couldn't have hovered we couldn't have hovered you couldn't have hovered they couldn't have hovered
V-ing perfect
I couldn't have been hovering you couldn't have been hovering he couldn't have been hovering we couldn't have been hovering you couldn't have been hovering they couldn't have been hovering
Interrogative form
Simple form
could I hover? could you hover? could he hover? could we hover? could you hover? could they hover?
V-ing form
could I be hovering? could you be hovering? could he be hovering? could we be hovering? could you be hovering? could they be hovering?
Perfect
could I have hovered? could you have hovered? could he have hovered? could we have hovered? could you have hovered? could they have hovered?
V-ing perfect
could I have been hovering? could you have been hovering? could he have been hovering? could we have been hovering? could you have been hovering? could they have been hovering?
Interro-negative form
Simple form
couldn't I hover? couldn't you hover? couldn't he hover? couldn't we hover? couldn't you hover? couldn't they hover?
V-ing form
couldn't I be hovering? couldn't you be hovering? couldn't he be hovering? couldn't we be hovering? couldn't you be hovering? couldn't they be hovering?
Perfect
couldn't I have hovered? couldn't you have hovered? couldn't he have hovered? couldn't we have hovered? couldn't you have hovered? couldn't they have hovered?
V-ing perfect
couldn't I have been hovering? couldn't you have been hovering? couldn't he have been hovering? couldn't we have been hovering? couldn't you have been hovering? couldn't they have been hovering?