could colorize
Regular verb: colorize - colorized- colorized

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could colorize
you could colorize
she could colorize
we could colorize
you could colorize
they could colorize 	I could be colorizing
you could be colorizing
she could be colorizing
we could be colorizing
you could be colorizing
they could be colorizing	I could have colorized
you could have colorized
she could have colorized
we could have colorized
you could have colorized
they could have colorized	I could have been colorizing
you could have been colorizing
she could have been colorizing
we could have been colorizing
you could have been colorizing
they could have been colorizing	

Negation 	
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I couldn't colorize
you couldn't colorize
she couldn't colorize
we couldn't colorize
you couldn't colorize
they couldn't colorize 	I couldn't be colorizing
you couldn't be colorizing
she couldn't be colorizing
we couldn't be colorizing
you couldn't be colorizing
they couldn't be colorizing	I couldn't have colorized
you couldn't have colorized
she couldn't have colorized
we couldn't have colorized
you couldn't have colorized
they couldn't have colorized	I couldn't have been colorizing
you couldn't have been colorizing
she couldn't have been colorizing
we couldn't have been colorizing
you couldn't have been colorizing
they couldn't have been colorizing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I colorize?
could you colorize?
could she colorize?
could we colorize?
could you colorize?
could they colorize? 	could I be colorizing?
could you be colorizing?
could she be colorizing?
could we be colorizing?
could you be colorizing?
could they be colorizing? 	could I have colorized?
could you have colorized?
could she have colorized?
could we have colorized?
could you have colorized?
could they have colorized? 	could I have been colorizing?
could you have been colorizing?
could she have been colorizing?
could we have been colorizing?
could you have been colorizing?
could they have been colorizing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I colorize?
couldn't you colorize?
couldn't she colorize?
couldn't we colorize?
couldn't you colorize?
couldn't they colorize? 	couldn't I be colorizing?
couldn't you be colorizing?
couldn't she be colorizing?
couldn't we be colorizing?
couldn't you be colorizing?
couldn't they be colorizing? 	couldn't I have colorized?
couldn't you have colorized?
couldn't she have colorized?
couldn't we have colorized?
couldn't you have colorized?
couldn't they have colorized? 	couldn't I have been colorizing?
couldn't you have been colorizing?
couldn't she have been colorizing?
couldn't we have been colorizing?
couldn't you have been colorizing?
couldn't they have been colorizing?