I could staunch you could staunch she could staunch we could staunch you could staunch they could staunch
V-ing form
I could be staunching you could be staunching she could be staunching we could be staunching you could be staunching they could be staunching
Perfect
I could have staunched you could have staunched she 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 she 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 she 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 she 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 she 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 she 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 she staunch? could we staunch? could you staunch? could they staunch?
V-ing form
could I be staunching? could you be staunching? could she be staunching? could we be staunching? could you be staunching? could they be staunching?
Perfect
could I have staunched? could you have staunched? could she 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 she 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 she 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 she 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 she 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 she not have been staunching? could we not have been staunching? could you not have been staunching? could they not have been staunching?