could centralise
Regular verb: centralise - centralised- centralised

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could centralise
you could centralise
he could centralise
we could centralise
you could centralise
they could centralise 	I could be centralising
you could be centralising
he could be centralising
we could be centralising
you could be centralising
they could be centralising	I could have centralised
you could have centralised
he could have centralised
we could have centralised
you could have centralised
they could have centralised	I could have been centralising
you could have been centralising
he could have been centralising
we could have been centralising
you could have been centralising
they could have been centralising	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't centralise
you couldn't centralise
he couldn't centralise
we couldn't centralise
you couldn't centralise
they couldn't centralise 	I couldn't be centralising
you couldn't be centralising
he couldn't be centralising
we couldn't be centralising
you couldn't be centralising
they couldn't be centralising	I couldn't have centralised
you couldn't have centralised
he couldn't have centralised
we couldn't have centralised
you couldn't have centralised
they couldn't have centralised	I couldn't have been centralising
you couldn't have been centralising
he couldn't have been centralising
we couldn't have been centralising
you couldn't have been centralising
they couldn't have been centralising	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I centralise?
could you centralise?
could he centralise?
could we centralise?
could you centralise?
could they centralise? 	could I be centralising?
could you be centralising?
could he be centralising?
could we be centralising?
could you be centralising?
could they be centralising? 	could I have centralised?
could you have centralised?
could he have centralised?
could we have centralised?
could you have centralised?
could they have centralised? 	could I have been centralising?
could you have been centralising?
could he have been centralising?
could we have been centralising?
could you have been centralising?
could they have been centralising? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I centralise?
couldn't you centralise?
couldn't he centralise?
couldn't we centralise?
couldn't you centralise?
couldn't they centralise? 	couldn't I be centralising?
couldn't you be centralising?
couldn't he be centralising?
couldn't we be centralising?
couldn't you be centralising?
couldn't they be centralising? 	couldn't I have centralised?
couldn't you have centralised?
couldn't he have centralised?
couldn't we have centralised?
couldn't you have centralised?
couldn't they have centralised? 	couldn't I have been centralising?
couldn't you have been centralising?
couldn't he have been centralising?
couldn't we have been centralising?
couldn't you have been centralising?
couldn't they have been centralising?