English verb conjugation
MUST UNDERGO

Irregular verb: undergo - underwent - undergone

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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

Negation

Simple form	V-ing form
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
Perfect	V-ing perfect
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

Interrogative form

Simple form	V-ing form
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?
Perfect	V-ing perfect
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?

Interro-negative form

Simple form	V-ing form
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?
Perfect	V-ing perfect
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?