I could blame you could blame he could blame we could blame you could blame they could blame
V-ing form
I could be blaming you could be blaming he could be blaming we could be blaming you could be blaming they could be blaming
Perfect
I could have blamed you could have blamed he could have blamed we could have blamed you could have blamed they could have blamed
V-ing perfect
I could have been blaming you could have been blaming he could have been blaming we could have been blaming you could have been blaming they could have been blaming
Negation
Simple form
I couldn't blame you couldn't blame he couldn't blame we couldn't blame you couldn't blame they couldn't blame
V-ing form
I couldn't be blaming you couldn't be blaming he couldn't be blaming we couldn't be blaming you couldn't be blaming they couldn't be blaming
Perfect
I couldn't have blamed you couldn't have blamed he couldn't have blamed we couldn't have blamed you couldn't have blamed they couldn't have blamed
V-ing perfect
I couldn't have been blaming you couldn't have been blaming he couldn't have been blaming we couldn't have been blaming you couldn't have been blaming they couldn't have been blaming
Interrogative form
Simple form
could I blame? could you blame? could he blame? could we blame? could you blame? could they blame?
V-ing form
could I be blaming? could you be blaming? could he be blaming? could we be blaming? could you be blaming? could they be blaming?
Perfect
could I have blamed? could you have blamed? could he have blamed? could we have blamed? could you have blamed? could they have blamed?
V-ing perfect
could I have been blaming? could you have been blaming? could he have been blaming? could we have been blaming? could you have been blaming? could they have been blaming?
Interro-negative form
Simple form
couldn't I blame? couldn't you blame? couldn't he blame? couldn't we blame? couldn't you blame? couldn't they blame?
V-ing form
couldn't I be blaming? couldn't you be blaming? couldn't he be blaming? couldn't we be blaming? couldn't you be blaming? couldn't they be blaming?
Perfect
couldn't I have blamed? couldn't you have blamed? couldn't he have blamed? couldn't we have blamed? couldn't you have blamed? couldn't they have blamed?
V-ing perfect
couldn't I have been blaming? couldn't you have been blaming? couldn't he have been blaming? couldn't we have been blaming? couldn't you have been blaming? couldn't they have been blaming?