must decaffeinate
Regular verb: decaffeinate - decaffeinated- decaffeinated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must decaffeinate
you must decaffeinate
he must decaffeinate
we must decaffeinate
you must decaffeinate
they must decaffeinate 	I must be decaffeinating
you must be decaffeinating
he must be decaffeinating
we must be decaffeinating
you must be decaffeinating
they must be decaffeinating	I must have decaffeinated
you must have decaffeinated
he must have decaffeinated
we must have decaffeinated
you must have decaffeinated
they must have decaffeinated	I must have been decaffeinating
you must have been decaffeinating
he must have been decaffeinating
we must have been decaffeinating
you must have been decaffeinating
they must have been decaffeinating	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't decaffeinate
you mustn't decaffeinate
he mustn't decaffeinate
we mustn't decaffeinate
you mustn't decaffeinate
they mustn't decaffeinate 	I mustn't be decaffeinating
you mustn't be decaffeinating
he mustn't be decaffeinating
we mustn't be decaffeinating
you mustn't be decaffeinating
they mustn't be decaffeinating	I mustn't have decaffeinated
you mustn't have decaffeinated
he mustn't have decaffeinated
we mustn't have decaffeinated
you mustn't have decaffeinated
they mustn't have decaffeinated	I mustn't have been decaffeinating
you mustn't have been decaffeinating
he mustn't have been decaffeinating
we mustn't have been decaffeinating
you mustn't have been decaffeinating
they mustn't have been decaffeinating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I decaffeinate?
must you decaffeinate?
must he decaffeinate?
must we decaffeinate?
must you decaffeinate?
must they decaffeinate? 	must I be decaffeinating?
must you be decaffeinating?
must he be decaffeinating?
must we be decaffeinating?
must you be decaffeinating?
must they be decaffeinating? 	must I have decaffeinated?
must you have decaffeinated?
must he have decaffeinated?
must we have decaffeinated?
must you have decaffeinated?
must they have decaffeinated? 	must I have been decaffeinating?
must you have been decaffeinating?
must he have been decaffeinating?
must we have been decaffeinating?
must you have been decaffeinating?
must they have been decaffeinating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I decaffeinate?
mustn't you decaffeinate?
mustn't he decaffeinate?
mustn't we decaffeinate?
mustn't you decaffeinate?
mustn't they decaffeinate? 	mustn't I be decaffeinating?
mustn't you be decaffeinating?
mustn't he be decaffeinating?
mustn't we be decaffeinating?
mustn't you be decaffeinating?
mustn't they be decaffeinating? 	mustn't I have decaffeinated?
mustn't you have decaffeinated?
mustn't he have decaffeinated?
mustn't we have decaffeinated?
mustn't you have decaffeinated?
mustn't they have decaffeinated? 	mustn't I have been decaffeinating?
mustn't you have been decaffeinating?
mustn't he have been decaffeinating?
mustn't we have been decaffeinating?
mustn't you have been decaffeinating?
mustn't they have been decaffeinating?