could systemize
Regular verb: systemize - systemized- systemized

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could systemize
you could systemize
he could systemize
we could systemize
you could systemize
they could systemize 	I could be systemizing
you could be systemizing
he could be systemizing
we could be systemizing
you could be systemizing
they could be systemizing	I could have systemized
you could have systemized
he could have systemized
we could have systemized
you could have systemized
they could have systemized	I could have been systemizing
you could have been systemizing
he could have been systemizing
we could have been systemizing
you could have been systemizing
they could have been systemizing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't systemize
you couldn't systemize
he couldn't systemize
we couldn't systemize
you couldn't systemize
they couldn't systemize 	I couldn't be systemizing
you couldn't be systemizing
he couldn't be systemizing
we couldn't be systemizing
you couldn't be systemizing
they couldn't be systemizing	I couldn't have systemized
you couldn't have systemized
he couldn't have systemized
we couldn't have systemized
you couldn't have systemized
they couldn't have systemized	I couldn't have been systemizing
you couldn't have been systemizing
he couldn't have been systemizing
we couldn't have been systemizing
you couldn't have been systemizing
they couldn't have been systemizing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I systemize?
could you systemize?
could he systemize?
could we systemize?
could you systemize?
could they systemize? 	could I be systemizing?
could you be systemizing?
could he be systemizing?
could we be systemizing?
could you be systemizing?
could they be systemizing? 	could I have systemized?
could you have systemized?
could he have systemized?
could we have systemized?
could you have systemized?
could they have systemized? 	could I have been systemizing?
could you have been systemizing?
could he have been systemizing?
could we have been systemizing?
could you have been systemizing?
could they have been systemizing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I systemize?
couldn't you systemize?
couldn't he systemize?
couldn't we systemize?
couldn't you systemize?
couldn't they systemize? 	couldn't I be systemizing?
couldn't you be systemizing?
couldn't he be systemizing?
couldn't we be systemizing?
couldn't you be systemizing?
couldn't they be systemizing? 	couldn't I have systemized?
couldn't you have systemized?
couldn't he have systemized?
couldn't we have systemized?
couldn't you have systemized?
couldn't they have systemized? 	couldn't I have been systemizing?
couldn't you have been systemizing?
couldn't he have been systemizing?
couldn't we have been systemizing?
couldn't you have been systemizing?
couldn't they have been systemizing?