could centralize
Regular verb: centralize - centralized- centralized

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could centralize
you could centralize
he could centralize
we could centralize
you could centralize
they could centralize 	I could be centralizing
you could be centralizing
he could be centralizing
we could be centralizing
you could be centralizing
they could be centralizing	I could have centralized
you could have centralized
he could have centralized
we could have centralized
you could have centralized
they could have centralized	I could have been centralizing
you could have been centralizing
he could have been centralizing
we could have been centralizing
you could have been centralizing
they could have been centralizing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't centralize
you couldn't centralize
he couldn't centralize
we couldn't centralize
you couldn't centralize
they couldn't centralize 	I couldn't be centralizing
you couldn't be centralizing
he couldn't be centralizing
we couldn't be centralizing
you couldn't be centralizing
they couldn't be centralizing	I couldn't have centralized
you couldn't have centralized
he couldn't have centralized
we couldn't have centralized
you couldn't have centralized
they couldn't have centralized	I couldn't have been centralizing
you couldn't have been centralizing
he couldn't have been centralizing
we couldn't have been centralizing
you couldn't have been centralizing
they couldn't have been centralizing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I centralize?
could you centralize?
could he centralize?
could we centralize?
could you centralize?
could they centralize? 	could I be centralizing?
could you be centralizing?
could he be centralizing?
could we be centralizing?
could you be centralizing?
could they be centralizing? 	could I have centralized?
could you have centralized?
could he have centralized?
could we have centralized?
could you have centralized?
could they have centralized? 	could I have been centralizing?
could you have been centralizing?
could he have been centralizing?
could we have been centralizing?
could you have been centralizing?
could they have been centralizing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I centralize?
couldn't you centralize?
couldn't he centralize?
couldn't we centralize?
couldn't you centralize?
couldn't they centralize? 	couldn't I be centralizing?
couldn't you be centralizing?
couldn't he be centralizing?
couldn't we be centralizing?
couldn't you be centralizing?
couldn't they be centralizing? 	couldn't I have centralized?
couldn't you have centralized?
couldn't he have centralized?
couldn't we have centralized?
couldn't you have centralized?
couldn't they have centralized? 	couldn't I have been centralizing?
couldn't you have been centralizing?
couldn't he have been centralizing?
couldn't we have been centralizing?
couldn't you have been centralizing?
couldn't they have been centralizing?