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