could undergo
Verbo irregular: undergo - underwent- undergone

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could undergo
you could undergo
he could undergo
we could undergo
you could undergo
they could undergo 	I could be undergoing
you could be undergoing
he could be undergoing
we could be undergoing
you could be undergoing
they could be undergoing	I could have undergone
you could have undergone
he could have undergone
we could have undergone
you could have undergone
they could have undergone	I could have been undergoing
you could have been undergoing
he could have been undergoing
we could have been undergoing
you could have been undergoing
they could have been undergoing	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I couldn't undergo
you couldn't undergo
he couldn't undergo
we couldn't undergo
you couldn't undergo
they couldn't undergo 	I couldn't be undergoing
you couldn't be undergoing
he couldn't be undergoing
we couldn't be undergoing
you couldn't be undergoing
they couldn't be undergoing	I couldn't have undergone
you couldn't have undergone
he couldn't have undergone
we couldn't have undergone
you couldn't have undergone
they couldn't have undergone	I couldn't have been undergoing
you couldn't have been undergoing
he couldn't have been undergoing
we couldn't have been undergoing
you couldn't have been undergoing
they couldn't have been undergoing	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I undergo?
could you undergo?
could he undergo?
could we undergo?
could you undergo?
could they undergo? 	could I be undergoing?
could you be undergoing?
could he be undergoing?
could we be undergoing?
could you be undergoing?
could they be undergoing? 	could I have undergone?
could you have undergone?
could he have undergone?
could we have undergone?
could you have undergone?
could they have undergone? 	could I have been undergoing?
could you have been undergoing?
could he have been undergoing?
could we have been undergoing?
could you have been undergoing?
could they have been undergoing? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
couldn't I undergo?
couldn't you undergo?
couldn't he undergo?
couldn't we undergo?
couldn't you undergo?
couldn't they undergo? 	couldn't I be undergoing?
couldn't you be undergoing?
couldn't he be undergoing?
couldn't we be undergoing?
couldn't you be undergoing?
couldn't they be undergoing? 	couldn't I have undergone?
couldn't you have undergone?
couldn't he have undergone?
couldn't we have undergone?
couldn't you have undergone?
couldn't they have undergone? 	couldn't I have been undergoing?
couldn't you have been undergoing?
couldn't he have been undergoing?
couldn't we have been undergoing?
couldn't you have been undergoing?
couldn't they have been undergoing?