could luster
Regular verb: luster - lustered- lustered

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

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

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

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