I could staunch you could staunch he could staunch we could staunch you could staunch they could staunch
V-ing form
I could be staunching you could be staunching he could be staunching we could be staunching you could be staunching they could be staunching
Perfect
I could have staunched you could have staunched he could have staunched we could have staunched you could have staunched they could have staunched
V-ing perfect
I could have been staunching you could have been staunching he could have been staunching we could have been staunching you could have been staunching they could have been staunching
Negation
Simple form
I could not staunch you could not staunch he could not staunch we could not staunch you could not staunch they could not staunch
V-ing form
I could not be staunching you could not be staunching he could not be staunching we could not be staunching you could not be staunching they could not be staunching
Perfect
I could not have staunched you could not have staunched he could not have staunched we could not have staunched you could not have staunched they could not have staunched
V-ing perfect
I could not have been staunching you could not have been staunching he could not have been staunching we could not have been staunching you could not have been staunching they could not have been staunching
Interrogative form
Simple form
could I staunch? could you staunch? could he staunch? could we staunch? could you staunch? could they staunch?
V-ing form
could I be staunching? could you be staunching? could he be staunching? could we be staunching? could you be staunching? could they be staunching?
Perfect
could I have staunched? could you have staunched? could he have staunched? could we have staunched? could you have staunched? could they have staunched?
V-ing perfect
could I have been staunching? could you have been staunching? could he have been staunching? could we have been staunching? could you have been staunching? could they have been staunching?
Interro-negative form
Simple form
could I not staunch? could you not staunch? could he not staunch? could we not staunch? could you not staunch? could they not staunch?
V-ing form
could I not be staunching? could you not be staunching? could he not be staunching? could we not be staunching? could you not be staunching? could they not be staunching?
Perfect
could I not have staunched? could you not have staunched? could he not have staunched? could we not have staunched? could you not have staunched? could they not have staunched?
V-ing perfect
could I not have been staunching? could you not have been staunching? could he not have been staunching? could we not have been staunching? could you not have been staunching? could they not have been staunching?