English verb conjugation
MUST LIVEN

Regular verb: liven - livened - livened

Affirmation

Simple form	V-ing form
I must liven you must liven he must liven we must liven you must liven they must liven	I must be livening you must be livening he must be livening we must be livening you must be livening they must be livening
Perfect	V-ing perfect
I must have livened you must have livened he must have livened we must have livened you must have livened they must have livened	I must have been livening you must have been livening he must have been livening we must have been livening you must have been livening they must have been livening

Negation

Simple form	V-ing form
I must not liven you must not liven he must not liven we must not liven you must not liven they must not liven	I must not be livening you must not be livening he must not be livening we must not be livening you must not be livening they must not be livening
Perfect	V-ing perfect
I must not have livened you must not have livened he must not have livened we must not have livened you must not have livened they must not have livened	I must not have been livening you must not have been livening he must not have been livening we must not have been livening you must not have been livening they must not have been livening

Interrogative form

Simple form	V-ing form
must I liven? must you liven? must he liven? must we liven? must you liven? must they liven?	must I be livening? must you be livening? must he be livening? must we be livening? must you be livening? must they be livening?
Perfect	V-ing perfect
must I have livened? must you have livened? must he have livened? must we have livened? must you have livened? must they have livened?	must I have been livening? must you have been livening? must he have been livening? must we have been livening? must you have been livening? must they have been livening?

Interro-negative form

Simple form	V-ing form
must I not liven? must you not liven? must he not liven? must we not liven? must you not liven? must they not liven?	must I not be livening? must you not be livening? must he not be livening? must we not be livening? must you not be livening? must they not be livening?
Perfect	V-ing perfect
must I not have livened? must you not have livened? must he not have livened? must we not have livened? must you not have livened? must they not have livened?	must I not have been livening? must you not have been livening? must he not have been livening? must we not have been livening? must you not have been livening? must they not have been livening?