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 must not orb
you must not orb
she must not orb
we must not orb
you must not orb
they must not orb 	I must not be orbing
you must not be orbing
she must not be orbing
we must not be orbing
you must not be orbing
they must not be orbing	I must not have orbed
you must not have orbed
she must not have orbed
we must not have orbed
you must not have orbed
they must not have orbed	I must not have been orbing
you must not have been orbing
she must not have been orbing
we must not have been orbing
you must not have been orbing
they must not 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 	
must I not orb?
must you not orb?
must she not orb?
must we not orb?
must you not orb?
must they not orb? 	must I not be orbing?
must you not be orbing?
must she not be orbing?
must we not be orbing?
must you not be orbing?
must they not be orbing? 	must I not have orbed?
must you not have orbed?
must she not have orbed?
must we not have orbed?
must you not have orbed?
must they not have orbed? 	must I not have been orbing?
must you not have been orbing?
must she not have been orbing?
must we not have been orbing?
must you not have been orbing?
must they not have been orbing?