could colourize
Regular verb: colourize - colourized- colourized

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could colourize
you could colourize
she could colourize
we could colourize
you could colourize
they could colourize 	I could be colourizing
you could be colourizing
she could be colourizing
we could be colourizing
you could be colourizing
they could be colourizing	I could have colourized
you could have colourized
she could have colourized
we could have colourized
you could have colourized
they could have colourized	I could have been colourizing
you could have been colourizing
she could have been colourizing
we could have been colourizing
you could have been colourizing
they could have been colourizing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not colourize
you could not colourize
she could not colourize
we could not colourize
you could not colourize
they could not colourize 	I could not be colourizing
you could not be colourizing
she could not be colourizing
we could not be colourizing
you could not be colourizing
they could not be colourizing	I could not have colourized
you could not have colourized
she could not have colourized
we could not have colourized
you could not have colourized
they could not have colourized	I could not have been colourizing
you could not have been colourizing
she could not have been colourizing
we could not have been colourizing
you could not have been colourizing
they could not have been colourizing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I colourize?
could you colourize?
could she colourize?
could we colourize?
could you colourize?
could they colourize? 	could I be colourizing?
could you be colourizing?
could she be colourizing?
could we be colourizing?
could you be colourizing?
could they be colourizing? 	could I have colourized?
could you have colourized?
could she have colourized?
could we have colourized?
could you have colourized?
could they have colourized? 	could I have been colourizing?
could you have been colourizing?
could she have been colourizing?
could we have been colourizing?
could you have been colourizing?
could they have been colourizing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not colourize?
could you not colourize?
could she not colourize?
could we not colourize?
could you not colourize?
could they not colourize? 	could I not be colourizing?
could you not be colourizing?
could she not be colourizing?
could we not be colourizing?
could you not be colourizing?
could they not be colourizing? 	could I not have colourized?
could you not have colourized?
could she not have colourized?
could we not have colourized?
could you not have colourized?
could they not have colourized? 	could I not have been colourizing?
could you not have been colourizing?
could she not have been colourizing?
could we not have been colourizing?
could you not have been colourizing?
could they not have been colourizing?