must double-time
Regular verb: double-time - double-timed- double-timed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must double-time
you must double-time
she must double-time
we must double-time
you must double-time
they must double-time 	I must be double-timing
you must be double-timing
she must be double-timing
we must be double-timing
you must be double-timing
they must be double-timing	I must have double-timed
you must have double-timed
she must have double-timed
we must have double-timed
you must have double-timed
they must have double-timed	I must have been double-timing
you must have been double-timing
she 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 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't double-time
you mustn't double-time
she mustn't double-time
we mustn't double-time
you mustn't double-time
they mustn't double-time 	I mustn't be double-timing
you mustn't be double-timing
she mustn't be double-timing
we mustn't be double-timing
you mustn't be double-timing
they mustn't be double-timing	I mustn't have double-timed
you mustn't have double-timed
she mustn't have double-timed
we mustn't have double-timed
you mustn't have double-timed
they mustn't have double-timed	I mustn't have been double-timing
you mustn't have been double-timing
she 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 	V-ing form 	Perfect 	V-ing perfect 	
must I double-time?
must you double-time?
must she double-time?
must we double-time?
must you double-time?
must they double-time? 	must I be double-timing?
must you be double-timing?
must she be double-timing?
must we be double-timing?
must you be double-timing?
must they be double-timing? 	must I have double-timed?
must you have double-timed?
must she have double-timed?
must we have double-timed?
must you have double-timed?
must they have double-timed? 	must I have been double-timing?
must you have been double-timing?
must she 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 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I double-time?
mustn't you double-time?
mustn't she double-time?
mustn't we double-time?
mustn't you double-time?
mustn't they double-time? 	mustn't I be double-timing?
mustn't you be double-timing?
mustn't she be double-timing?
mustn't we be double-timing?
mustn't you be double-timing?
mustn't they be double-timing? 	mustn't I have double-timed?
mustn't you have double-timed?
mustn't she have double-timed?
mustn't we have double-timed?
mustn't you have double-timed?
mustn't they have double-timed? 	mustn't I have been double-timing?
mustn't you have been double-timing?
mustn't she 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?