must bung
Regular verb: bung - bunged- bunged

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must bung
you must bung
he must bung
we must bung
you must bung
they must bung 	I must be bunging
you must be bunging
he must be bunging
we must be bunging
you must be bunging
they must be bunging	I must have bunged
you must have bunged
he must have bunged
we must have bunged
you must have bunged
they must have bunged	I must have been bunging
you must have been bunging
he must have been bunging
we must have been bunging
you must have been bunging
they must have been bunging	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't bung
you mustn't bung
he mustn't bung
we mustn't bung
you mustn't bung
they mustn't bung 	I mustn't be bunging
you mustn't be bunging
he mustn't be bunging
we mustn't be bunging
you mustn't be bunging
they mustn't be bunging	I mustn't have bunged
you mustn't have bunged
he mustn't have bunged
we mustn't have bunged
you mustn't have bunged
they mustn't have bunged	I mustn't have been bunging
you mustn't have been bunging
he mustn't have been bunging
we mustn't have been bunging
you mustn't have been bunging
they mustn't have been bunging	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I bung?
must you bung?
must he bung?
must we bung?
must you bung?
must they bung? 	must I be bunging?
must you be bunging?
must he be bunging?
must we be bunging?
must you be bunging?
must they be bunging? 	must I have bunged?
must you have bunged?
must he have bunged?
must we have bunged?
must you have bunged?
must they have bunged? 	must I have been bunging?
must you have been bunging?
must he have been bunging?
must we have been bunging?
must you have been bunging?
must they have been bunging? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I bung?
mustn't you bung?
mustn't he bung?
mustn't we bung?
mustn't you bung?
mustn't they bung? 	mustn't I be bunging?
mustn't you be bunging?
mustn't he be bunging?
mustn't we be bunging?
mustn't you be bunging?
mustn't they be bunging? 	mustn't I have bunged?
mustn't you have bunged?
mustn't he have bunged?
mustn't we have bunged?
mustn't you have bunged?
mustn't they have bunged? 	mustn't I have been bunging?
mustn't you have been bunging?
mustn't he have been bunging?
mustn't we have been bunging?
mustn't you have been bunging?
mustn't they have been bunging?