must undergo
Verbo irregular: undergo - underwent- undergone

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com 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	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must not undergo
you must not undergo
he must not undergo
we must not undergo
you must not undergo
they must not undergo 	I must not be undergoing
you must not be undergoing
he must not be undergoing
we must not be undergoing
you must not be undergoing
they must not be undergoing	I must not have undergone
you must not have undergone
he must not have undergone
we must not have undergone
you must not have undergone
they must not have undergone	I must not have been undergoing
you must not have been undergoing
he must not have been undergoing
we must not have been undergoing
you must not have been undergoing
they must not have been undergoing	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com 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-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I not undergo?
must you not undergo?
must he not undergo?
must we not undergo?
must you not undergo?
must they not undergo? 	must I not be undergoing?
must you not be undergoing?
must he not be undergoing?
must we not be undergoing?
must you not be undergoing?
must they not be undergoing? 	must I not have undergone?
must you not have undergone?
must he not have undergone?
must we not have undergone?
must you not have undergone?
must they not have undergone? 	must I not have been undergoing?
must you not have been undergoing?
must he not have been undergoing?
must we not have been undergoing?
must you not have been undergoing?
must they not have been undergoing?