must modulate
Regular verb: modulate - modulated- modulated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must modulate
you must modulate
he must modulate
we must modulate
you must modulate
they must modulate 	I must be modulating
you must be modulating
he must be modulating
we must be modulating
you must be modulating
they must be modulating	I must have modulated
you must have modulated
he must have modulated
we must have modulated
you must have modulated
they must have modulated	I must have been modulating
you must have been modulating
he must have been modulating
we must have been modulating
you must have been modulating
they must have been modulating	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't modulate
you mustn't modulate
he mustn't modulate
we mustn't modulate
you mustn't modulate
they mustn't modulate 	I mustn't be modulating
you mustn't be modulating
he mustn't be modulating
we mustn't be modulating
you mustn't be modulating
they mustn't be modulating	I mustn't have modulated
you mustn't have modulated
he mustn't have modulated
we mustn't have modulated
you mustn't have modulated
they mustn't have modulated	I mustn't have been modulating
you mustn't have been modulating
he mustn't have been modulating
we mustn't have been modulating
you mustn't have been modulating
they mustn't have been modulating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I modulate?
must you modulate?
must he modulate?
must we modulate?
must you modulate?
must they modulate? 	must I be modulating?
must you be modulating?
must he be modulating?
must we be modulating?
must you be modulating?
must they be modulating? 	must I have modulated?
must you have modulated?
must he have modulated?
must we have modulated?
must you have modulated?
must they have modulated? 	must I have been modulating?
must you have been modulating?
must he have been modulating?
must we have been modulating?
must you have been modulating?
must they have been modulating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I modulate?
mustn't you modulate?
mustn't he modulate?
mustn't we modulate?
mustn't you modulate?
mustn't they modulate? 	mustn't I be modulating?
mustn't you be modulating?
mustn't he be modulating?
mustn't we be modulating?
mustn't you be modulating?
mustn't they be modulating? 	mustn't I have modulated?
mustn't you have modulated?
mustn't he have modulated?
mustn't we have modulated?
mustn't you have modulated?
mustn't they have modulated? 	mustn't I have been modulating?
mustn't you have been modulating?
mustn't he have been modulating?
mustn't we have been modulating?
mustn't you have been modulating?
mustn't they have been modulating?