could systemise
Regular verb: systemise - systemised- systemised

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could systemise
you could systemise
he could systemise
we could systemise
you could systemise
they could systemise 	I could be systemising
you could be systemising
he could be systemising
we could be systemising
you could be systemising
they could be systemising	I could have systemised
you could have systemised
he could have systemised
we could have systemised
you could have systemised
they could have systemised	I could have been systemising
you could have been systemising
he could have been systemising
we could have been systemising
you could have been systemising
they could have been systemising	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't systemise
you couldn't systemise
he couldn't systemise
we couldn't systemise
you couldn't systemise
they couldn't systemise 	I couldn't be systemising
you couldn't be systemising
he couldn't be systemising
we couldn't be systemising
you couldn't be systemising
they couldn't be systemising	I couldn't have systemised
you couldn't have systemised
he couldn't have systemised
we couldn't have systemised
you couldn't have systemised
they couldn't have systemised	I couldn't have been systemising
you couldn't have been systemising
he couldn't have been systemising
we couldn't have been systemising
you couldn't have been systemising
they couldn't have been systemising	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I systemise?
could you systemise?
could he systemise?
could we systemise?
could you systemise?
could they systemise? 	could I be systemising?
could you be systemising?
could he be systemising?
could we be systemising?
could you be systemising?
could they be systemising? 	could I have systemised?
could you have systemised?
could he have systemised?
could we have systemised?
could you have systemised?
could they have systemised? 	could I have been systemising?
could you have been systemising?
could he have been systemising?
could we have been systemising?
could you have been systemising?
could they have been systemising? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I systemise?
couldn't you systemise?
couldn't he systemise?
couldn't we systemise?
couldn't you systemise?
couldn't they systemise? 	couldn't I be systemising?
couldn't you be systemising?
couldn't he be systemising?
couldn't we be systemising?
couldn't you be systemising?
couldn't they be systemising? 	couldn't I have systemised?
couldn't you have systemised?
couldn't he have systemised?
couldn't we have systemised?
couldn't you have systemised?
couldn't they have systemised? 	couldn't I have been systemising?
couldn't you have been systemising?
couldn't he have been systemising?
couldn't we have been systemising?
couldn't you have been systemising?
couldn't they have been systemising?