I must double-space you must double-space he must double-space we must double-space you must double-space they must double-space
V-ing form
I must be double-spacing you must be double-spacing he must be double-spacing we must be double-spacing you must be double-spacing they must be double-spacing
Perfect
I must have double-spaced you must have double-spaced he must have double-spaced we must have double-spaced you must have double-spaced they must have double-spaced
V-ing perfect
I must have been double-spacing you must have been double-spacing he must have been double-spacing we must have been double-spacing you must have been double-spacing they must have been double-spacing
Negation
Simple form
I mustn't double-space you mustn't double-space he mustn't double-space we mustn't double-space you mustn't double-space they mustn't double-space
V-ing form
I mustn't be double-spacing you mustn't be double-spacing he mustn't be double-spacing we mustn't be double-spacing you mustn't be double-spacing they mustn't be double-spacing
Perfect
I mustn't have double-spaced you mustn't have double-spaced he mustn't have double-spaced we mustn't have double-spaced you mustn't have double-spaced they mustn't have double-spaced
V-ing perfect
I mustn't have been double-spacing you mustn't have been double-spacing he mustn't have been double-spacing we mustn't have been double-spacing you mustn't have been double-spacing they mustn't have been double-spacing
Interrogative form
Simple form
must I double-space? must you double-space? must he double-space? must we double-space? must you double-space? must they double-space?
V-ing form
must I be double-spacing? must you be double-spacing? must he be double-spacing? must we be double-spacing? must you be double-spacing? must they be double-spacing?
Perfect
must I have double-spaced? must you have double-spaced? must he have double-spaced? must we have double-spaced? must you have double-spaced? must they have double-spaced?
V-ing perfect
must I have been double-spacing? must you have been double-spacing? must he have been double-spacing? must we have been double-spacing? must you have been double-spacing? must they have been double-spacing?
Interro-negative form
Simple form
mustn't I double-space? mustn't you double-space? mustn't he double-space? mustn't we double-space? mustn't you double-space? mustn't they double-space?
V-ing form
mustn't I be double-spacing? mustn't you be double-spacing? mustn't he be double-spacing? mustn't we be double-spacing? mustn't you be double-spacing? mustn't they be double-spacing?
Perfect
mustn't I have double-spaced? mustn't you have double-spaced? mustn't he have double-spaced? mustn't we have double-spaced? mustn't you have double-spaced? mustn't they have double-spaced?
V-ing perfect
mustn't I have been double-spacing? mustn't you have been double-spacing? mustn't he have been double-spacing? mustn't we have been double-spacing? mustn't you have been double-spacing? mustn't they have been double-spacing?