must stiff-arm
Regular verb: stiff-arm - stiff-armed- stiff-armed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must stiff-arm
you must stiff-arm
he must stiff-arm
we must stiff-arm
you must stiff-arm
they must stiff-arm 	I must be stiff-arming
you must be stiff-arming
he must be stiff-arming
we must be stiff-arming
you must be stiff-arming
they must be stiff-arming	I must have stiff-armed
you must have stiff-armed
he must have stiff-armed
we must have stiff-armed
you must have stiff-armed
they must have stiff-armed	I must have been stiff-arming
you must have been stiff-arming
he must have been stiff-arming
we must have been stiff-arming
you must have been stiff-arming
they must have been stiff-arming	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not stiff-arm
you must not stiff-arm
he must not stiff-arm
we must not stiff-arm
you must not stiff-arm
they must not stiff-arm 	I must not be stiff-arming
you must not be stiff-arming
he must not be stiff-arming
we must not be stiff-arming
you must not be stiff-arming
they must not be stiff-arming	I must not have stiff-armed
you must not have stiff-armed
he must not have stiff-armed
we must not have stiff-armed
you must not have stiff-armed
they must not have stiff-armed	I must not have been stiff-arming
you must not have been stiff-arming
he must not have been stiff-arming
we must not have been stiff-arming
you must not have been stiff-arming
they must not have been stiff-arming	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I stiff-arm?
must you stiff-arm?
must he stiff-arm?
must we stiff-arm?
must you stiff-arm?
must they stiff-arm? 	must I be stiff-arming?
must you be stiff-arming?
must he be stiff-arming?
must we be stiff-arming?
must you be stiff-arming?
must they be stiff-arming? 	must I have stiff-armed?
must you have stiff-armed?
must he have stiff-armed?
must we have stiff-armed?
must you have stiff-armed?
must they have stiff-armed? 	must I have been stiff-arming?
must you have been stiff-arming?
must he have been stiff-arming?
must we have been stiff-arming?
must you have been stiff-arming?
must they have been stiff-arming? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not stiff-arm?
must you not stiff-arm?
must he not stiff-arm?
must we not stiff-arm?
must you not stiff-arm?
must they not stiff-arm? 	must I not be stiff-arming?
must you not be stiff-arming?
must he not be stiff-arming?
must we not be stiff-arming?
must you not be stiff-arming?
must they not be stiff-arming? 	must I not have stiff-armed?
must you not have stiff-armed?
must he not have stiff-armed?
must we not have stiff-armed?
must you not have stiff-armed?
must they not have stiff-armed? 	must I not have been stiff-arming?
must you not have been stiff-arming?
must he not have been stiff-arming?
must we not have been stiff-arming?
must you not have been stiff-arming?
must they not have been stiff-arming?