can undergo
Irregular verb: undergo - underwent- undergone

Affirmation 	
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I can undergo
you can undergo
he can undergo
we can undergo
you can undergo
they can undergo 	I can be undergoing
you can be undergoing
he can be undergoing
we can be undergoing
you can be undergoing
they can be undergoing	I can have undergone
you can have undergone
he can have undergone
we can have undergone
you can have undergone
they can have undergone	I can have been undergoing
you can have been undergoing
he can have been undergoing
we can have been undergoing
you can have been undergoing
they can have been undergoing	

Negation 	
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I can't undergo
you can't undergo
he can't undergo
we can't undergo
you can't undergo
they can't undergo 	I can't be undergoing
you can't be undergoing
he can't be undergoing
we can't be undergoing
you can't be undergoing
they can't be undergoing	I can't have undergone
you can't have undergone
he can't have undergone
we can't have undergone
you can't have undergone
they can't have undergone	I can't have been undergoing
you can't have been undergoing
he can't have been undergoing
we can't have been undergoing
you can't have been undergoing
they can't have been undergoing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I undergo?
can you undergo?
can he undergo?
can we undergo?
can you undergo?
can they undergo? 	can I be undergoing?
can you be undergoing?
can he be undergoing?
can we be undergoing?
can you be undergoing?
can they be undergoing? 	can I have undergone?
can you have undergone?
can he have undergone?
can we have undergone?
can you have undergone?
can they have undergone? 	can I have been undergoing?
can you have been undergoing?
can he have been undergoing?
can we have been undergoing?
can you have been undergoing?
can they have been undergoing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can't I undergo?
can't you undergo?
can't he undergo?
can't we undergo?
can't you undergo?
can't they undergo? 	can't I be undergoing?
can't you be undergoing?
can't he be undergoing?
can't we be undergoing?
can't you be undergoing?
can't they be undergoing? 	can't I have undergone?
can't you have undergone?
can't he have undergone?
can't we have undergone?
can't you have undergone?
can't they have undergone? 	can't I have been undergoing?
can't you have been undergoing?
can't he have been undergoing?
can't we have been undergoing?
can't you have been undergoing?
can't they have been undergoing?