could marbleize
Regular verb: marbleize - marbleized- marbleized

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could marbleize
you could marbleize
he could marbleize
we could marbleize
you could marbleize
they could marbleize 	I could be marbleizing
you could be marbleizing
he could be marbleizing
we could be marbleizing
you could be marbleizing
they could be marbleizing	I could have marbleized
you could have marbleized
he could have marbleized
we could have marbleized
you could have marbleized
they could have marbleized	I could have been marbleizing
you could have been marbleizing
he could have been marbleizing
we could have been marbleizing
you could have been marbleizing
they could have been marbleizing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't marbleize
you couldn't marbleize
he couldn't marbleize
we couldn't marbleize
you couldn't marbleize
they couldn't marbleize 	I couldn't be marbleizing
you couldn't be marbleizing
he couldn't be marbleizing
we couldn't be marbleizing
you couldn't be marbleizing
they couldn't be marbleizing	I couldn't have marbleized
you couldn't have marbleized
he couldn't have marbleized
we couldn't have marbleized
you couldn't have marbleized
they couldn't have marbleized	I couldn't have been marbleizing
you couldn't have been marbleizing
he couldn't have been marbleizing
we couldn't have been marbleizing
you couldn't have been marbleizing
they couldn't have been marbleizing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I marbleize?
could you marbleize?
could he marbleize?
could we marbleize?
could you marbleize?
could they marbleize? 	could I be marbleizing?
could you be marbleizing?
could he be marbleizing?
could we be marbleizing?
could you be marbleizing?
could they be marbleizing? 	could I have marbleized?
could you have marbleized?
could he have marbleized?
could we have marbleized?
could you have marbleized?
could they have marbleized? 	could I have been marbleizing?
could you have been marbleizing?
could he have been marbleizing?
could we have been marbleizing?
could you have been marbleizing?
could they have been marbleizing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I marbleize?
couldn't you marbleize?
couldn't he marbleize?
couldn't we marbleize?
couldn't you marbleize?
couldn't they marbleize? 	couldn't I be marbleizing?
couldn't you be marbleizing?
couldn't he be marbleizing?
couldn't we be marbleizing?
couldn't you be marbleizing?
couldn't they be marbleizing? 	couldn't I have marbleized?
couldn't you have marbleized?
couldn't he have marbleized?
couldn't we have marbleized?
couldn't you have marbleized?
couldn't they have marbleized? 	couldn't I have been marbleizing?
couldn't you have been marbleizing?
couldn't he have been marbleizing?
couldn't we have been marbleizing?
couldn't you have been marbleizing?
couldn't they have been marbleizing?