could customize
Regular verb: customize - customized- customized

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could customize
you could customize
he could customize
we could customize
you could customize
they could customize 	I could be customizing
you could be customizing
he could be customizing
we could be customizing
you could be customizing
they could be customizing	I could have customized
you could have customized
he could have customized
we could have customized
you could have customized
they could have customized	I could have been customizing
you could have been customizing
he could have been customizing
we could have been customizing
you could have been customizing
they could have been customizing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not customize
you could not customize
he could not customize
we could not customize
you could not customize
they could not customize 	I could not be customizing
you could not be customizing
he could not be customizing
we could not be customizing
you could not be customizing
they could not be customizing	I could not have customized
you could not have customized
he could not have customized
we could not have customized
you could not have customized
they could not have customized	I could not have been customizing
you could not have been customizing
he could not have been customizing
we could not have been customizing
you could not have been customizing
they could not have been customizing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I customize?
could you customize?
could he customize?
could we customize?
could you customize?
could they customize? 	could I be customizing?
could you be customizing?
could he be customizing?
could we be customizing?
could you be customizing?
could they be customizing? 	could I have customized?
could you have customized?
could he have customized?
could we have customized?
could you have customized?
could they have customized? 	could I have been customizing?
could you have been customizing?
could he have been customizing?
could we have been customizing?
could you have been customizing?
could they have been customizing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not customize?
could you not customize?
could he not customize?
could we not customize?
could you not customize?
could they not customize? 	could I not be customizing?
could you not be customizing?
could he not be customizing?
could we not be customizing?
could you not be customizing?
could they not be customizing? 	could I not have customized?
could you not have customized?
could he not have customized?
could we not have customized?
could you not have customized?
could they not have customized? 	could I not have been customizing?
could you not have been customizing?
could he not have been customizing?
could we not have been customizing?
could you not have been customizing?
could they not have been customizing?