must double-lock
Regular verb: double-lock - double-locked- double-locked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must double-lock
you must double-lock
he must double-lock
we must double-lock
you must double-lock
they must double-lock 	I must be double-locking
you must be double-locking
he must be double-locking
we must be double-locking
you must be double-locking
they must be double-locking	I must have double-locked
you must have double-locked
he must have double-locked
we must have double-locked
you must have double-locked
they must have double-locked	I must have been double-locking
you must have been double-locking
he must have been double-locking
we must have been double-locking
you must have been double-locking
they must have been double-locking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't double-lock
you mustn't double-lock
he mustn't double-lock
we mustn't double-lock
you mustn't double-lock
they mustn't double-lock 	I mustn't be double-locking
you mustn't be double-locking
he mustn't be double-locking
we mustn't be double-locking
you mustn't be double-locking
they mustn't be double-locking	I mustn't have double-locked
you mustn't have double-locked
he mustn't have double-locked
we mustn't have double-locked
you mustn't have double-locked
they mustn't have double-locked	I mustn't have been double-locking
you mustn't have been double-locking
he mustn't have been double-locking
we mustn't have been double-locking
you mustn't have been double-locking
they mustn't have been double-locking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I double-lock?
must you double-lock?
must he double-lock?
must we double-lock?
must you double-lock?
must they double-lock? 	must I be double-locking?
must you be double-locking?
must he be double-locking?
must we be double-locking?
must you be double-locking?
must they be double-locking? 	must I have double-locked?
must you have double-locked?
must he have double-locked?
must we have double-locked?
must you have double-locked?
must they have double-locked? 	must I have been double-locking?
must you have been double-locking?
must he have been double-locking?
must we have been double-locking?
must you have been double-locking?
must they have been double-locking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I double-lock?
mustn't you double-lock?
mustn't he double-lock?
mustn't we double-lock?
mustn't you double-lock?
mustn't they double-lock? 	mustn't I be double-locking?
mustn't you be double-locking?
mustn't he be double-locking?
mustn't we be double-locking?
mustn't you be double-locking?
mustn't they be double-locking? 	mustn't I have double-locked?
mustn't you have double-locked?
mustn't he have double-locked?
mustn't we have double-locked?
mustn't you have double-locked?
mustn't they have double-locked? 	mustn't I have been double-locking?
mustn't you have been double-locking?
mustn't he have been double-locking?
mustn't we have been double-locking?
mustn't you have been double-locking?
mustn't they have been double-locking?