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 must not haven you must not haven he must not haven we must not haven you must not haven they must not haven	I must not be havening you must not be havening he must not be havening we must not be havening you must not be havening they must not be havening
Perfect	V-ing perfect
I must not have havened you must not have havened he must not have havened we must not have havened you must not have havened they must not have havened	I must not have been havening you must not have been havening he must not have been havening we must not have been havening you must not have been havening they must not 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
must I not haven? must you not haven? must he not haven? must we not haven? must you not haven? must they not haven?	must I not be havening? must you not be havening? must he not be havening? must we not be havening? must you not be havening? must they not be havening?
Perfect	V-ing perfect
must I not have havened? must you not have havened? must he not have havened? must we not have havened? must you not have havened? must they not have havened?	must I not have been havening? must you not have been havening? must he not have been havening? must we not have been havening? must you not have been havening? must they not have been havening?