must orb
Regular verb: orb - orbed- orbed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must orb
you must orb
she must orb
we must orb
you must orb
they must orb 	I must be orbing
you must be orbing
she must be orbing
we must be orbing
you must be orbing
they must be orbing	I must have orbed
you must have orbed
she must have orbed
we must have orbed
you must have orbed
they must have orbed	I must have been orbing
you must have been orbing
she must have been orbing
we must have been orbing
you must have been orbing
they must have been orbing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't orb
you mustn't orb
she mustn't orb
we mustn't orb
you mustn't orb
they mustn't orb 	I mustn't be orbing
you mustn't be orbing
she mustn't be orbing
we mustn't be orbing
you mustn't be orbing
they mustn't be orbing	I mustn't have orbed
you mustn't have orbed
she mustn't have orbed
we mustn't have orbed
you mustn't have orbed
they mustn't have orbed	I mustn't have been orbing
you mustn't have been orbing
she mustn't have been orbing
we mustn't have been orbing
you mustn't have been orbing
they mustn't have been orbing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I orb?
must you orb?
must she orb?
must we orb?
must you orb?
must they orb? 	must I be orbing?
must you be orbing?
must she be orbing?
must we be orbing?
must you be orbing?
must they be orbing? 	must I have orbed?
must you have orbed?
must she have orbed?
must we have orbed?
must you have orbed?
must they have orbed? 	must I have been orbing?
must you have been orbing?
must she have been orbing?
must we have been orbing?
must you have been orbing?
must they have been orbing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I orb?
mustn't you orb?
mustn't she orb?
mustn't we orb?
mustn't you orb?
mustn't they orb? 	mustn't I be orbing?
mustn't you be orbing?
mustn't she be orbing?
mustn't we be orbing?
mustn't you be orbing?
mustn't they be orbing? 	mustn't I have orbed?
mustn't you have orbed?
mustn't she have orbed?
mustn't we have orbed?
mustn't you have orbed?
mustn't they have orbed? 	mustn't I have been orbing?
mustn't you have been orbing?
mustn't she have been orbing?
mustn't we have been orbing?
mustn't you have been orbing?
mustn't they have been orbing?