could factorize
Regular verb: factorize - factorized- factorized

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could factorize
you could factorize
he could factorize
we could factorize
you could factorize
they could factorize 	I could be factorizing
you could be factorizing
he could be factorizing
we could be factorizing
you could be factorizing
they could be factorizing	I could have factorized
you could have factorized
he could have factorized
we could have factorized
you could have factorized
they could have factorized	I could have been factorizing
you could have been factorizing
he could have been factorizing
we could have been factorizing
you could have been factorizing
they could have been factorizing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not factorize
you could not factorize
he could not factorize
we could not factorize
you could not factorize
they could not factorize 	I could not be factorizing
you could not be factorizing
he could not be factorizing
we could not be factorizing
you could not be factorizing
they could not be factorizing	I could not have factorized
you could not have factorized
he could not have factorized
we could not have factorized
you could not have factorized
they could not have factorized	I could not have been factorizing
you could not have been factorizing
he could not have been factorizing
we could not have been factorizing
you could not have been factorizing
they could not have been factorizing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I factorize?
could you factorize?
could he factorize?
could we factorize?
could you factorize?
could they factorize? 	could I be factorizing?
could you be factorizing?
could he be factorizing?
could we be factorizing?
could you be factorizing?
could they be factorizing? 	could I have factorized?
could you have factorized?
could he have factorized?
could we have factorized?
could you have factorized?
could they have factorized? 	could I have been factorizing?
could you have been factorizing?
could he have been factorizing?
could we have been factorizing?
could you have been factorizing?
could they have been factorizing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not factorize?
could you not factorize?
could he not factorize?
could we not factorize?
could you not factorize?
could they not factorize? 	could I not be factorizing?
could you not be factorizing?
could he not be factorizing?
could we not be factorizing?
could you not be factorizing?
could they not be factorizing? 	could I not have factorized?
could you not have factorized?
could he not have factorized?
could we not have factorized?
could you not have factorized?
could they not have factorized? 	could I not have been factorizing?
could you not have been factorizing?
could he not have been factorizing?
could we not have been factorizing?
could you not have been factorizing?
could they not have been factorizing?