must characterize
Verbo regular: characterize - characterized- characterized

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must characterize
you must characterize
he must characterize
we must characterize
you must characterize
they must characterize 	I must be characterizing
you must be characterizing
he must be characterizing
we must be characterizing
you must be characterizing
they must be characterizing	I must have characterized
you must have characterized
he must have characterized
we must have characterized
you must have characterized
they must have characterized	I must have been characterizing
you must have been characterizing
he must have been characterizing
we must have been characterizing
you must have been characterizing
they must have been characterizing	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I mustn't characterize
you mustn't characterize
he mustn't characterize
we mustn't characterize
you mustn't characterize
they mustn't characterize 	I mustn't be characterizing
you mustn't be characterizing
he mustn't be characterizing
we mustn't be characterizing
you mustn't be characterizing
they mustn't be characterizing	I mustn't have characterized
you mustn't have characterized
he mustn't have characterized
we mustn't have characterized
you mustn't have characterized
they mustn't have characterized	I mustn't have been characterizing
you mustn't have been characterizing
he mustn't have been characterizing
we mustn't have been characterizing
you mustn't have been characterizing
they mustn't have been characterizing	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I characterize?
must you characterize?
must he characterize?
must we characterize?
must you characterize?
must they characterize? 	must I be characterizing?
must you be characterizing?
must he be characterizing?
must we be characterizing?
must you be characterizing?
must they be characterizing? 	must I have characterized?
must you have characterized?
must he have characterized?
must we have characterized?
must you have characterized?
must they have characterized? 	must I have been characterizing?
must you have been characterizing?
must he have been characterizing?
must we have been characterizing?
must you have been characterizing?
must they have been characterizing? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
mustn't I characterize?
mustn't you characterize?
mustn't he characterize?
mustn't we characterize?
mustn't you characterize?
mustn't they characterize? 	mustn't I be characterizing?
mustn't you be characterizing?
mustn't he be characterizing?
mustn't we be characterizing?
mustn't you be characterizing?
mustn't they be characterizing? 	mustn't I have characterized?
mustn't you have characterized?
mustn't he have characterized?
mustn't we have characterized?
mustn't you have characterized?
mustn't they have characterized? 	mustn't I have been characterizing?
mustn't you have been characterizing?
mustn't he have been characterizing?
mustn't we have been characterizing?
mustn't you have been characterizing?
mustn't they have been characterizing?