English verb conjugation
MUST HAVEN

Regular verb: haven - havened - havened

Affirmation

Simple form	V-ing form
I must haven you must haven he must haven we must haven you must haven they must haven	I must be havening you must be havening he must be havening we must be havening you must be havening they must be havening
Perfect	V-ing perfect
I must have havened you must have havened he must have havened we must have havened you must have havened they must have havened	I must have been havening you must have been havening he must have been havening we must have been havening you must have been havening they must have been havening

Negation

Simple form	V-ing form
I mustn't haven you mustn't haven he mustn't haven we mustn't haven you mustn't haven they mustn't haven	I mustn't be havening you mustn't be havening he mustn't be havening we mustn't be havening you mustn't be havening they mustn't be havening
Perfect	V-ing perfect
I mustn't have havened you mustn't have havened he mustn't have havened we mustn't have havened you mustn't have havened they mustn't have havened	I mustn't have been havening you mustn't have been havening he mustn't have been havening we mustn't have been havening you mustn't have been havening they mustn't have been havening

Interrogative form

Simple form	V-ing form
must I haven? must you haven? must he haven? must we haven? must you haven? must they haven?	must I be havening? must you be havening? must he be havening? must we be havening? must you be havening? must they be havening?
Perfect	V-ing perfect
must I have havened? must you have havened? must he have havened? must we have havened? must you have havened? must they have havened?	must I have been havening? must you have been havening? must he have been havening? must we have been havening? must you have been havening? must they have been havening?

Interro-negative form

Simple form	V-ing form
mustn't I haven? mustn't you haven? mustn't he haven? mustn't we haven? mustn't you haven? mustn't they haven?	mustn't I be havening? mustn't you be havening? mustn't he be havening? mustn't we be havening? mustn't you be havening? mustn't they be havening?
Perfect	V-ing perfect
mustn't I have havened? mustn't you have havened? mustn't he have havened? mustn't we have havened? mustn't you have havened? mustn't they have havened?	mustn't I have been havening? mustn't you have been havening? mustn't he have been havening? mustn't we have been havening? mustn't you have been havening? mustn't they have been havening?