must undergo
Verbo irregular: undergo - underwent- undergone

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must undergo
you must undergo
he must undergo
we must undergo
you must undergo
they must undergo 	I must be undergoing
you must be undergoing
he must be undergoing
we must be undergoing
you must be undergoing
they must be undergoing	I must have undergone
you must have undergone
he must have undergone
we must have undergone
you must have undergone
they must have undergone	I must have been undergoing
you must have been undergoing
he must have been undergoing
we must have been undergoing
you must have been undergoing
they must have been undergoing	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I mustn't undergo
you mustn't undergo
he mustn't undergo
we mustn't undergo
you mustn't undergo
they mustn't undergo 	I mustn't be undergoing
you mustn't be undergoing
he mustn't be undergoing
we mustn't be undergoing
you mustn't be undergoing
they mustn't be undergoing	I mustn't have undergone
you mustn't have undergone
he mustn't have undergone
we mustn't have undergone
you mustn't have undergone
they mustn't have undergone	I mustn't have been undergoing
you mustn't have been undergoing
he mustn't have been undergoing
we mustn't have been undergoing
you mustn't have been undergoing
they mustn't have been undergoing	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I undergo?
must you undergo?
must he undergo?
must we undergo?
must you undergo?
must they undergo? 	must I be undergoing?
must you be undergoing?
must he be undergoing?
must we be undergoing?
must you be undergoing?
must they be undergoing? 	must I have undergone?
must you have undergone?
must he have undergone?
must we have undergone?
must you have undergone?
must they have undergone? 	must I have been undergoing?
must you have been undergoing?
must he have been undergoing?
must we have been undergoing?
must you have been undergoing?
must they have been undergoing? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
mustn't I undergo?
mustn't you undergo?
mustn't he undergo?
mustn't we undergo?
mustn't you undergo?
mustn't they undergo? 	mustn't I be undergoing?
mustn't you be undergoing?
mustn't he be undergoing?
mustn't we be undergoing?
mustn't you be undergoing?
mustn't they be undergoing? 	mustn't I have undergone?
mustn't you have undergone?
mustn't he have undergone?
mustn't we have undergone?
mustn't you have undergone?
mustn't they have undergone? 	mustn't I have been undergoing?
mustn't you have been undergoing?
mustn't he have been undergoing?
mustn't we have been undergoing?
mustn't you have been undergoing?
mustn't they have been undergoing?