I could save you could save she could save we could save you could save they could save
V-ing form
I could be saving you could be saving she could be saving we could be saving you could be saving they could be saving
Perfect
I could have saved you could have saved she could have saved we could have saved you could have saved they could have saved
V-ing perfect
I could have been saving you could have been saving she could have been saving we could have been saving you could have been saving they could have been saving
Negation
Simple form
I could not save you could not save she could not save we could not save you could not save they could not save
V-ing form
I could not be saving you could not be saving she could not be saving we could not be saving you could not be saving they could not be saving
Perfect
I could not have saved you could not have saved she could not have saved we could not have saved you could not have saved they could not have saved
V-ing perfect
I could not have been saving you could not have been saving she could not have been saving we could not have been saving you could not have been saving they could not have been saving
Interrogative form
Simple form
could I save? could you save? could she save? could we save? could you save? could they save?
V-ing form
could I be saving? could you be saving? could she be saving? could we be saving? could you be saving? could they be saving?
Perfect
could I have saved? could you have saved? could she have saved? could we have saved? could you have saved? could they have saved?
V-ing perfect
could I have been saving? could you have been saving? could she have been saving? could we have been saving? could you have been saving? could they have been saving?
Interro-negative form
Simple form
could I not save? could you not save? could she not save? could we not save? could you not save? could they not save?
V-ing form
could I not be saving? could you not be saving? could she not be saving? could we not be saving? could you not be saving? could they not be saving?
Perfect
could I not have saved? could you not have saved? could she not have saved? could we not have saved? could you not have saved? could they not have saved?
V-ing perfect
could I not have been saving? could you not have been saving? could she not have been saving? could we not have been saving? could you not have been saving? could they not have been saving?