could colonize
Regular verb: colonize - colonized- colonized

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could colonize
you could colonize
he could colonize
we could colonize
you could colonize
they could colonize 	I could be colonizing
you could be colonizing
he could be colonizing
we could be colonizing
you could be colonizing
they could be colonizing	I could have colonized
you could have colonized
he could have colonized
we could have colonized
you could have colonized
they could have colonized	I could have been colonizing
you could have been colonizing
he could have been colonizing
we could have been colonizing
you could have been colonizing
they could have been colonizing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't colonize
you couldn't colonize
he couldn't colonize
we couldn't colonize
you couldn't colonize
they couldn't colonize 	I couldn't be colonizing
you couldn't be colonizing
he couldn't be colonizing
we couldn't be colonizing
you couldn't be colonizing
they couldn't be colonizing	I couldn't have colonized
you couldn't have colonized
he couldn't have colonized
we couldn't have colonized
you couldn't have colonized
they couldn't have colonized	I couldn't have been colonizing
you couldn't have been colonizing
he couldn't have been colonizing
we couldn't have been colonizing
you couldn't have been colonizing
they couldn't have been colonizing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I colonize?
could you colonize?
could he colonize?
could we colonize?
could you colonize?
could they colonize? 	could I be colonizing?
could you be colonizing?
could he be colonizing?
could we be colonizing?
could you be colonizing?
could they be colonizing? 	could I have colonized?
could you have colonized?
could he have colonized?
could we have colonized?
could you have colonized?
could they have colonized? 	could I have been colonizing?
could you have been colonizing?
could he have been colonizing?
could we have been colonizing?
could you have been colonizing?
could they have been colonizing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I colonize?
couldn't you colonize?
couldn't he colonize?
couldn't we colonize?
couldn't you colonize?
couldn't they colonize? 	couldn't I be colonizing?
couldn't you be colonizing?
couldn't he be colonizing?
couldn't we be colonizing?
couldn't you be colonizing?
couldn't they be colonizing? 	couldn't I have colonized?
couldn't you have colonized?
couldn't he have colonized?
couldn't we have colonized?
couldn't you have colonized?
couldn't they have colonized? 	couldn't I have been colonizing?
couldn't you have been colonizing?
couldn't he have been colonizing?
couldn't we have been colonizing?
couldn't you have been colonizing?
couldn't they have been colonizing?