I can undergo you can undergo she can undergo we can undergo you can undergo they can undergo
V-ing form
I can be undergoing you can be undergoing she can be undergoing we can be undergoing you can be undergoing they can be undergoing
Perfect
I can have undergone you can have undergone she can have undergone we can have undergone you can have undergone they can have undergone
V-ing perfect
I can have been undergoing you can have been undergoing she can have been undergoing we can have been undergoing you can have been undergoing they can have been undergoing
Negation
Simple form
I cannot undergo you cannot undergo she cannot undergo we cannot undergo you cannot undergo they cannot undergo
V-ing form
I cannot be undergoing you cannot be undergoing she cannot be undergoing we cannot be undergoing you cannot be undergoing they cannot be undergoing
Perfect
I cannot have undergone you cannot have undergone she cannot have undergone we cannot have undergone you cannot have undergone they cannot have undergone
V-ing perfect
I cannot have been undergoing you cannot have been undergoing she cannot have been undergoing we cannot have been undergoing you cannot have been undergoing they cannot have been undergoing
Interrogative form
Simple form
can I undergo? can you undergo? can she undergo? can we undergo? can you undergo? can they undergo?
V-ing form
can I be undergoing? can you be undergoing? can she be undergoing? can we be undergoing? can you be undergoing? can they be undergoing?
Perfect
can I have undergone? can you have undergone? can she have undergone? can we have undergone? can you have undergone? can they have undergone?
V-ing perfect
can I have been undergoing? can you have been undergoing? can she have been undergoing? can we have been undergoing? can you have been undergoing? can they have been undergoing?
Interro-negative form
Simple form
can I not undergo? can you not undergo? can she not undergo? can we not undergo? can you not undergo? can they not undergo?
V-ing form
can I not be undergoing? can you not be undergoing? can she not be undergoing? can we not be undergoing? can you not be undergoing? can they not be undergoing?
Perfect
can I not have undergone? can you not have undergone? can she not have undergone? can we not have undergone? can you not have undergone? can they not have undergone?
V-ing perfect
can I not have been undergoing? can you not have been undergoing? can she not have been undergoing? can we not have been undergoing? can you not have been undergoing? can they not have been undergoing?