could rechromatograph
Regular verb: rechromatograph - rechromatographed- rechromatographed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could rechromatograph
you could rechromatograph
he could rechromatograph
we could rechromatograph
you could rechromatograph
they could rechromatograph 	I could be rechromatographing
you could be rechromatographing
he could be rechromatographing
we could be rechromatographing
you could be rechromatographing
they could be rechromatographing	I could have rechromatographed
you could have rechromatographed
he could have rechromatographed
we could have rechromatographed
you could have rechromatographed
they could have rechromatographed	I could have been rechromatographing
you could have been rechromatographing
he could have been rechromatographing
we could have been rechromatographing
you could have been rechromatographing
they could have been rechromatographing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't rechromatograph
you couldn't rechromatograph
he couldn't rechromatograph
we couldn't rechromatograph
you couldn't rechromatograph
they couldn't rechromatograph 	I couldn't be rechromatographing
you couldn't be rechromatographing
he couldn't be rechromatographing
we couldn't be rechromatographing
you couldn't be rechromatographing
they couldn't be rechromatographing	I couldn't have rechromatographed
you couldn't have rechromatographed
he couldn't have rechromatographed
we couldn't have rechromatographed
you couldn't have rechromatographed
they couldn't have rechromatographed	I couldn't have been rechromatographing
you couldn't have been rechromatographing
he couldn't have been rechromatographing
we couldn't have been rechromatographing
you couldn't have been rechromatographing
they couldn't have been rechromatographing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I rechromatograph?
could you rechromatograph?
could he rechromatograph?
could we rechromatograph?
could you rechromatograph?
could they rechromatograph? 	could I be rechromatographing?
could you be rechromatographing?
could he be rechromatographing?
could we be rechromatographing?
could you be rechromatographing?
could they be rechromatographing? 	could I have rechromatographed?
could you have rechromatographed?
could he have rechromatographed?
could we have rechromatographed?
could you have rechromatographed?
could they have rechromatographed? 	could I have been rechromatographing?
could you have been rechromatographing?
could he have been rechromatographing?
could we have been rechromatographing?
could you have been rechromatographing?
could they have been rechromatographing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I rechromatograph?
couldn't you rechromatograph?
couldn't he rechromatograph?
couldn't we rechromatograph?
couldn't you rechromatograph?
couldn't they rechromatograph? 	couldn't I be rechromatographing?
couldn't you be rechromatographing?
couldn't he be rechromatographing?
couldn't we be rechromatographing?
couldn't you be rechromatographing?
couldn't they be rechromatographing? 	couldn't I have rechromatographed?
couldn't you have rechromatographed?
couldn't he have rechromatographed?
couldn't we have rechromatographed?
couldn't you have rechromatographed?
couldn't they have rechromatographed? 	couldn't I have been rechromatographing?
couldn't you have been rechromatographing?
couldn't he have been rechromatographing?
couldn't we have been rechromatographing?
couldn't you have been rechromatographing?
couldn't they have been rechromatographing?