must luster
Regular verb: luster - lustered- lustered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must luster
you must luster
he must luster
we must luster
you must luster
they must luster 	I must be lustering
you must be lustering
he must be lustering
we must be lustering
you must be lustering
they must be lustering	I must have lustered
you must have lustered
he must have lustered
we must have lustered
you must have lustered
they must have lustered	I must have been lustering
you must have been lustering
he must have been lustering
we must have been lustering
you must have been lustering
they must have been lustering	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't luster
you mustn't luster
he mustn't luster
we mustn't luster
you mustn't luster
they mustn't luster 	I mustn't be lustering
you mustn't be lustering
he mustn't be lustering
we mustn't be lustering
you mustn't be lustering
they mustn't be lustering	I mustn't have lustered
you mustn't have lustered
he mustn't have lustered
we mustn't have lustered
you mustn't have lustered
they mustn't have lustered	I mustn't have been lustering
you mustn't have been lustering
he mustn't have been lustering
we mustn't have been lustering
you mustn't have been lustering
they mustn't have been lustering	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I luster?
must you luster?
must he luster?
must we luster?
must you luster?
must they luster? 	must I be lustering?
must you be lustering?
must he be lustering?
must we be lustering?
must you be lustering?
must they be lustering? 	must I have lustered?
must you have lustered?
must he have lustered?
must we have lustered?
must you have lustered?
must they have lustered? 	must I have been lustering?
must you have been lustering?
must he have been lustering?
must we have been lustering?
must you have been lustering?
must they have been lustering? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I luster?
mustn't you luster?
mustn't he luster?
mustn't we luster?
mustn't you luster?
mustn't they luster? 	mustn't I be lustering?
mustn't you be lustering?
mustn't he be lustering?
mustn't we be lustering?
mustn't you be lustering?
mustn't they be lustering? 	mustn't I have lustered?
mustn't you have lustered?
mustn't he have lustered?
mustn't we have lustered?
mustn't you have lustered?
mustn't they have lustered? 	mustn't I have been lustering?
mustn't you have been lustering?
mustn't he have been lustering?
mustn't we have been lustering?
mustn't you have been lustering?
mustn't they have been lustering?