must mug
Regular verb: mug - mugged- mugged

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must mug
you must mug
she must mug
we must mug
you must mug
they must mug 	I must be mugging
you must be mugging
she must be mugging
we must be mugging
you must be mugging
they must be mugging	I must have mugged
you must have mugged
she must have mugged
we must have mugged
you must have mugged
they must have mugged	I must have been mugging
you must have been mugging
she must have been mugging
we must have been mugging
you must have been mugging
they must have been mugging	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't mug
you mustn't mug
she mustn't mug
we mustn't mug
you mustn't mug
they mustn't mug 	I mustn't be mugging
you mustn't be mugging
she mustn't be mugging
we mustn't be mugging
you mustn't be mugging
they mustn't be mugging	I mustn't have mugged
you mustn't have mugged
she mustn't have mugged
we mustn't have mugged
you mustn't have mugged
they mustn't have mugged	I mustn't have been mugging
you mustn't have been mugging
she mustn't have been mugging
we mustn't have been mugging
you mustn't have been mugging
they mustn't have been mugging	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I mug?
must you mug?
must she mug?
must we mug?
must you mug?
must they mug? 	must I be mugging?
must you be mugging?
must she be mugging?
must we be mugging?
must you be mugging?
must they be mugging? 	must I have mugged?
must you have mugged?
must she have mugged?
must we have mugged?
must you have mugged?
must they have mugged? 	must I have been mugging?
must you have been mugging?
must she have been mugging?
must we have been mugging?
must you have been mugging?
must they have been mugging? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I mug?
mustn't you mug?
mustn't she mug?
mustn't we mug?
mustn't you mug?
mustn't they mug? 	mustn't I be mugging?
mustn't you be mugging?
mustn't she be mugging?
mustn't we be mugging?
mustn't you be mugging?
mustn't they be mugging? 	mustn't I have mugged?
mustn't you have mugged?
mustn't she have mugged?
mustn't we have mugged?
mustn't you have mugged?
mustn't they have mugged? 	mustn't I have been mugging?
mustn't you have been mugging?
mustn't she have been mugging?
mustn't we have been mugging?
mustn't you have been mugging?
mustn't they have been mugging?