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