I could double-space you could double-space she could double-space we could double-space you could double-space they could double-space
V-ing form
I could be double-spacing you could be double-spacing she could be double-spacing we could be double-spacing you could be double-spacing they could be double-spacing
Perfect
I could have double-spaced you could have double-spaced she could have double-spaced we could have double-spaced you could have double-spaced they could have double-spaced
V-ing perfect
I could have been double-spacing you could have been double-spacing she could have been double-spacing we could have been double-spacing you could have been double-spacing they could have been double-spacing
Negation
Simple form
I could not double-space you could not double-space she could not double-space we could not double-space you could not double-space they could not double-space
V-ing form
I could not be double-spacing you could not be double-spacing she could not be double-spacing we could not be double-spacing you could not be double-spacing they could not be double-spacing
Perfect
I could not have double-spaced you could not have double-spaced she could not have double-spaced we could not have double-spaced you could not have double-spaced they could not have double-spaced
V-ing perfect
I could not have been double-spacing you could not have been double-spacing she could not have been double-spacing we could not have been double-spacing you could not have been double-spacing they could not have been double-spacing
Interrogative form
Simple form
could I double-space? could you double-space? could she double-space? could we double-space? could you double-space? could they double-space?
V-ing form
could I be double-spacing? could you be double-spacing? could she be double-spacing? could we be double-spacing? could you be double-spacing? could they be double-spacing?
Perfect
could I have double-spaced? could you have double-spaced? could she have double-spaced? could we have double-spaced? could you have double-spaced? could they have double-spaced?
V-ing perfect
could I have been double-spacing? could you have been double-spacing? could she have been double-spacing? could we have been double-spacing? could you have been double-spacing? could they have been double-spacing?
Interro-negative form
Simple form
could I not double-space? could you not double-space? could she not double-space? could we not double-space? could you not double-space? could they not double-space?
V-ing form
could I not be double-spacing? could you not be double-spacing? could she not be double-spacing? could we not be double-spacing? could you not be double-spacing? could they not be double-spacing?
Perfect
could I not have double-spaced? could you not have double-spaced? could she not have double-spaced? could we not have double-spaced? could you not have double-spaced? could they not have double-spaced?
V-ing perfect
could I not have been double-spacing? could you not have been double-spacing? could she not have been double-spacing? could we not have been double-spacing? could you not have been double-spacing? could they not have been double-spacing?