I could sunder you could sunder he could sunder we could sunder you could sunder they could sunder
V-ing form
I could be sundering you could be sundering he could be sundering we could be sundering you could be sundering they could be sundering
Perfect
I could have sundered you could have sundered he could have sundered we could have sundered you could have sundered they could have sundered
V-ing perfect
I could have been sundering you could have been sundering he could have been sundering we could have been sundering you could have been sundering they could have been sundering
Negation
Simple form
I could not sunder you could not sunder he could not sunder we could not sunder you could not sunder they could not sunder
V-ing form
I could not be sundering you could not be sundering he could not be sundering we could not be sundering you could not be sundering they could not be sundering
Perfect
I could not have sundered you could not have sundered he could not have sundered we could not have sundered you could not have sundered they could not have sundered
V-ing perfect
I could not have been sundering you could not have been sundering he could not have been sundering we could not have been sundering you could not have been sundering they could not have been sundering
Interrogative form
Simple form
could I sunder? could you sunder? could he sunder? could we sunder? could you sunder? could they sunder?
V-ing form
could I be sundering? could you be sundering? could he be sundering? could we be sundering? could you be sundering? could they be sundering?
Perfect
could I have sundered? could you have sundered? could he have sundered? could we have sundered? could you have sundered? could they have sundered?
V-ing perfect
could I have been sundering? could you have been sundering? could he have been sundering? could we have been sundering? could you have been sundering? could they have been sundering?
Interro-negative form
Simple form
could I not sunder? could you not sunder? could he not sunder? could we not sunder? could you not sunder? could they not sunder?
V-ing form
could I not be sundering? could you not be sundering? could he not be sundering? could we not be sundering? could you not be sundering? could they not be sundering?
Perfect
could I not have sundered? could you not have sundered? could he not have sundered? could we not have sundered? could you not have sundered? could they not have sundered?
V-ing perfect
could I not have been sundering? could you not have been sundering? could he not have been sundering? could we not have been sundering? could you not have been sundering? could they not have been sundering?