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 couldn't sunder you couldn't sunder he couldn't sunder we couldn't sunder you couldn't sunder they couldn't sunder
V-ing form
I couldn't be sundering you couldn't be sundering he couldn't be sundering we couldn't be sundering you couldn't be sundering they couldn't be sundering
Perfect
I couldn't have sundered you couldn't have sundered he couldn't have sundered we couldn't have sundered you couldn't have sundered they couldn't have sundered
V-ing perfect
I couldn't have been sundering you couldn't have been sundering he couldn't have been sundering we couldn't have been sundering you couldn't have been sundering they couldn't 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
couldn't I sunder? couldn't you sunder? couldn't he sunder? couldn't we sunder? couldn't you sunder? couldn't they sunder?
V-ing form
couldn't I be sundering? couldn't you be sundering? couldn't he be sundering? couldn't we be sundering? couldn't you be sundering? couldn't they be sundering?
Perfect
couldn't I have sundered? couldn't you have sundered? couldn't he have sundered? couldn't we have sundered? couldn't you have sundered? couldn't they have sundered?
V-ing perfect
couldn't I have been sundering? couldn't you have been sundering? couldn't he have been sundering? couldn't we have been sundering? couldn't you have been sundering? couldn't they have been sundering?