could colourise
Regular verb: colourise - colourised- colourised

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could colourise
you could colourise
she could colourise
we could colourise
you could colourise
they could colourise 	I could be colourising
you could be colourising
she could be colourising
we could be colourising
you could be colourising
they could be colourising	I could have colourised
you could have colourised
she could have colourised
we could have colourised
you could have colourised
they could have colourised	I could have been colourising
you could have been colourising
she could have been colourising
we could have been colourising
you could have been colourising
they could have been colourising	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not colourise
you could not colourise
she could not colourise
we could not colourise
you could not colourise
they could not colourise 	I could not be colourising
you could not be colourising
she could not be colourising
we could not be colourising
you could not be colourising
they could not be colourising	I could not have colourised
you could not have colourised
she could not have colourised
we could not have colourised
you could not have colourised
they could not have colourised	I could not have been colourising
you could not have been colourising
she could not have been colourising
we could not have been colourising
you could not have been colourising
they could not have been colourising	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I colourise?
could you colourise?
could she colourise?
could we colourise?
could you colourise?
could they colourise? 	could I be colourising?
could you be colourising?
could she be colourising?
could we be colourising?
could you be colourising?
could they be colourising? 	could I have colourised?
could you have colourised?
could she have colourised?
could we have colourised?
could you have colourised?
could they have colourised? 	could I have been colourising?
could you have been colourising?
could she have been colourising?
could we have been colourising?
could you have been colourising?
could they have been colourising? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not colourise?
could you not colourise?
could she not colourise?
could we not colourise?
could you not colourise?
could they not colourise? 	could I not be colourising?
could you not be colourising?
could she not be colourising?
could we not be colourising?
could you not be colourising?
could they not be colourising? 	could I not have colourised?
could you not have colourised?
could she not have colourised?
could we not have colourised?
could you not have colourised?
could they not have colourised? 	could I not have been colourising?
could you not have been colourising?
could she not have been colourising?
could we not have been colourising?
could you not have been colourising?
could they not have been colourising?