I could rechromatograph you could rechromatograph he could rechromatograph we could rechromatograph you could rechromatograph they could rechromatograph
V-ing form
I could be rechromatographing you could be rechromatographing he could be rechromatographing we could be rechromatographing you could be rechromatographing they could be rechromatographing
Perfect
I could have rechromatographed you could have rechromatographed he could have rechromatographed we could have rechromatographed you could have rechromatographed they could have rechromatographed
V-ing perfect
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
I could not rechromatograph you could not rechromatograph he could not rechromatograph we could not rechromatograph you could not rechromatograph they could not rechromatograph
V-ing form
I could not be rechromatographing you could not be rechromatographing he could not be rechromatographing we could not be rechromatographing you could not be rechromatographing they could not be rechromatographing
Perfect
I could not have rechromatographed you could not have rechromatographed he could not have rechromatographed we could not have rechromatographed you could not have rechromatographed they could not have rechromatographed
V-ing perfect
I could not have been rechromatographing you could not have been rechromatographing he could not have been rechromatographing we could not have been rechromatographing you could not have been rechromatographing they could not have been rechromatographing
Interrogative form
Simple form
could I rechromatograph? could you rechromatograph? could he rechromatograph? could we rechromatograph? could you rechromatograph? could they rechromatograph?
V-ing form
could I be rechromatographing? could you be rechromatographing? could he be rechromatographing? could we be rechromatographing? could you be rechromatographing? could they be rechromatographing?
Perfect
could I have rechromatographed? could you have rechromatographed? could he have rechromatographed? could we have rechromatographed? could you have rechromatographed? could they have rechromatographed?
V-ing perfect
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
could I not rechromatograph? could you not rechromatograph? could he not rechromatograph? could we not rechromatograph? could you not rechromatograph? could they not rechromatograph?
V-ing form
could I not be rechromatographing? could you not be rechromatographing? could he not be rechromatographing? could we not be rechromatographing? could you not be rechromatographing? could they not be rechromatographing?
Perfect
could I not have rechromatographed? could you not have rechromatographed? could he not have rechromatographed? could we not have rechromatographed? could you not have rechromatographed? could they not have rechromatographed?
V-ing perfect
could I not have been rechromatographing? could you not have been rechromatographing? could he not have been rechromatographing? could we not have been rechromatographing? could you not have been rechromatographing? could they not have been rechromatographing?