could systematise
Regular verb: systematise - systematised- systematised

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could systematise
you could systematise
she could systematise
we could systematise
you could systematise
they could systematise 	I could be systematising
you could be systematising
she could be systematising
we could be systematising
you could be systematising
they could be systematising	I could have systematised
you could have systematised
she could have systematised
we could have systematised
you could have systematised
they could have systematised	I could have been systematising
you could have been systematising
she could have been systematising
we could have been systematising
you could have been systematising
they could have been systematising	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not systematise
you could not systematise
she could not systematise
we could not systematise
you could not systematise
they could not systematise 	I could not be systematising
you could not be systematising
she could not be systematising
we could not be systematising
you could not be systematising
they could not be systematising	I could not have systematised
you could not have systematised
she could not have systematised
we could not have systematised
you could not have systematised
they could not have systematised	I could not have been systematising
you could not have been systematising
she could not have been systematising
we could not have been systematising
you could not have been systematising
they could not have been systematising	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I systematise?
could you systematise?
could she systematise?
could we systematise?
could you systematise?
could they systematise? 	could I be systematising?
could you be systematising?
could she be systematising?
could we be systematising?
could you be systematising?
could they be systematising? 	could I have systematised?
could you have systematised?
could she have systematised?
could we have systematised?
could you have systematised?
could they have systematised? 	could I have been systematising?
could you have been systematising?
could she have been systematising?
could we have been systematising?
could you have been systematising?
could they have been systematising? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not systematise?
could you not systematise?
could she not systematise?
could we not systematise?
could you not systematise?
could they not systematise? 	could I not be systematising?
could you not be systematising?
could she not be systematising?
could we not be systematising?
could you not be systematising?
could they not be systematising? 	could I not have systematised?
could you not have systematised?
could she not have systematised?
could we not have systematised?
could you not have systematised?
could they not have systematised? 	could I not have been systematising?
could you not have been systematising?
could she not have been systematising?
could we not have been systematising?
could you not have been systematising?
could they not have been systematising?