must liven
Regular verb: liven - livened- livened

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