English verb conjugation
MUST UNDERINSURE

Regular verb: underinsure - underinsured - underinsured

Affirmation

Simple form	V-ing form
I must underinsure you must underinsure she must underinsure we must underinsure you must underinsure they must underinsure	I must be underinsuring you must be underinsuring she must be underinsuring we must be underinsuring you must be underinsuring they must be underinsuring
Perfect	V-ing perfect
I must have underinsured you must have underinsured she must have underinsured we must have underinsured you must have underinsured they must have underinsured	I must have been underinsuring you must have been underinsuring she must have been underinsuring we must have been underinsuring you must have been underinsuring they must have been underinsuring

Negation

Simple form	V-ing form
I mustn't underinsure you mustn't underinsure she mustn't underinsure we mustn't underinsure you mustn't underinsure they mustn't underinsure	I mustn't be underinsuring you mustn't be underinsuring she mustn't be underinsuring we mustn't be underinsuring you mustn't be underinsuring they mustn't be underinsuring
Perfect	V-ing perfect
I mustn't have underinsured you mustn't have underinsured she mustn't have underinsured we mustn't have underinsured you mustn't have underinsured they mustn't have underinsured	I mustn't have been underinsuring you mustn't have been underinsuring she mustn't have been underinsuring we mustn't have been underinsuring you mustn't have been underinsuring they mustn't have been underinsuring

Interrogative form

Simple form	V-ing form
must I underinsure? must you underinsure? must she underinsure? must we underinsure? must you underinsure? must they underinsure?	must I be underinsuring? must you be underinsuring? must she be underinsuring? must we be underinsuring? must you be underinsuring? must they be underinsuring?
Perfect	V-ing perfect
must I have underinsured? must you have underinsured? must she have underinsured? must we have underinsured? must you have underinsured? must they have underinsured?	must I have been underinsuring? must you have been underinsuring? must she have been underinsuring? must we have been underinsuring? must you have been underinsuring? must they have been underinsuring?

Interro-negative form

Simple form	V-ing form
mustn't I underinsure? mustn't you underinsure? mustn't she underinsure? mustn't we underinsure? mustn't you underinsure? mustn't they underinsure?	mustn't I be underinsuring? mustn't you be underinsuring? mustn't she be underinsuring? mustn't we be underinsuring? mustn't you be underinsuring? mustn't they be underinsuring?
Perfect	V-ing perfect
mustn't I have underinsured? mustn't you have underinsured? mustn't she have underinsured? mustn't we have underinsured? mustn't you have underinsured? mustn't they have underinsured?	mustn't I have been underinsuring? mustn't you have been underinsuring? mustn't she have been underinsuring? mustn't we have been underinsuring? mustn't you have been underinsuring? mustn't they have been underinsuring?