must arm
Regular verb: arm - armed- armed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must arm
you must arm
she must arm
we must arm
you must arm
they must arm 	I must be arming
you must be arming
she must be arming
we must be arming
you must be arming
they must be arming	I must have armed
you must have armed
she 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
she 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
she 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
she 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
she 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
she 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 she arm?
must we arm?
must you arm?
must they arm? 	must I be arming?
must you be arming?
must she be arming?
must we be arming?
must you be arming?
must they be arming? 	must I have armed?
must you have armed?
must she 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 she 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 she 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 she 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 she 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 she have been arming?
mustn't we have been arming?
mustn't you have been arming?
mustn't they have been arming?