must arm
Regular verb: arm - armed- armed

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

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't arm
you mustn't arm
he mustn't arm
we mustn't arm
you mustn't arm
they mustn't arm 	I mustn't be arming
you mustn't be arming
he mustn't be arming
we mustn't be arming
you mustn't be arming
they mustn't be arming	I mustn't have armed
you mustn't have armed
he mustn't have armed
we mustn't have armed
you mustn't have armed
they mustn't have armed	I mustn't have been arming
you mustn't have been arming
he mustn't have been arming
we mustn't have been arming
you mustn't have been arming
they mustn't have been arming	

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

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I arm?
mustn't you arm?
mustn't he arm?
mustn't we arm?
mustn't you arm?
mustn't they arm? 	mustn't I be arming?
mustn't you be arming?
mustn't he be arming?
mustn't we be arming?
mustn't you be arming?
mustn't they be arming? 	mustn't I have armed?
mustn't you have armed?
mustn't he have armed?
mustn't we have armed?
mustn't you have armed?
mustn't they have armed? 	mustn't I have been arming?
mustn't you have been arming?
mustn't he have been arming?
mustn't we have been arming?
mustn't you have been arming?
mustn't they have been arming?