could customise
Regular verb: customise - customised- customised

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could customise
you could customise
he could customise
we could customise
you could customise
they could customise 	I could be customising
you could be customising
he could be customising
we could be customising
you could be customising
they could be customising	I could have customised
you could have customised
he could have customised
we could have customised
you could have customised
they could have customised	I could have been customising
you could have been customising
he could have been customising
we could have been customising
you could have been customising
they could have been customising	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't customise
you couldn't customise
he couldn't customise
we couldn't customise
you couldn't customise
they couldn't customise 	I couldn't be customising
you couldn't be customising
he couldn't be customising
we couldn't be customising
you couldn't be customising
they couldn't be customising	I couldn't have customised
you couldn't have customised
he couldn't have customised
we couldn't have customised
you couldn't have customised
they couldn't have customised	I couldn't have been customising
you couldn't have been customising
he couldn't have been customising
we couldn't have been customising
you couldn't have been customising
they couldn't have been customising	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I customise?
could you customise?
could he customise?
could we customise?
could you customise?
could they customise? 	could I be customising?
could you be customising?
could he be customising?
could we be customising?
could you be customising?
could they be customising? 	could I have customised?
could you have customised?
could he have customised?
could we have customised?
could you have customised?
could they have customised? 	could I have been customising?
could you have been customising?
could he have been customising?
could we have been customising?
could you have been customising?
could they have been customising? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I customise?
couldn't you customise?
couldn't he customise?
couldn't we customise?
couldn't you customise?
couldn't they customise? 	couldn't I be customising?
couldn't you be customising?
couldn't he be customising?
couldn't we be customising?
couldn't you be customising?
couldn't they be customising? 	couldn't I have customised?
couldn't you have customised?
couldn't he have customised?
couldn't we have customised?
couldn't you have customised?
couldn't they have customised? 	couldn't I have been customising?
couldn't you have been customising?
couldn't he have been customising?
couldn't we have been customising?
couldn't you have been customising?
couldn't they have been customising?