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