must humbug
Regular verb: humbug - humbugged- humbugged

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must humbug
you must humbug
he must humbug
we must humbug
you must humbug
they must humbug 	I must be humbugging
you must be humbugging
he must be humbugging
we must be humbugging
you must be humbugging
they must be humbugging	I must have humbugged
you must have humbugged
he must have humbugged
we must have humbugged
you must have humbugged
they must have humbugged	I must have been humbugging
you must have been humbugging
he must have been humbugging
we must have been humbugging
you must have been humbugging
they must have been humbugging	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't humbug
you mustn't humbug
he mustn't humbug
we mustn't humbug
you mustn't humbug
they mustn't humbug 	I mustn't be humbugging
you mustn't be humbugging
he mustn't be humbugging
we mustn't be humbugging
you mustn't be humbugging
they mustn't be humbugging	I mustn't have humbugged
you mustn't have humbugged
he mustn't have humbugged
we mustn't have humbugged
you mustn't have humbugged
they mustn't have humbugged	I mustn't have been humbugging
you mustn't have been humbugging
he mustn't have been humbugging
we mustn't have been humbugging
you mustn't have been humbugging
they mustn't have been humbugging	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I humbug?
must you humbug?
must he humbug?
must we humbug?
must you humbug?
must they humbug? 	must I be humbugging?
must you be humbugging?
must he be humbugging?
must we be humbugging?
must you be humbugging?
must they be humbugging? 	must I have humbugged?
must you have humbugged?
must he have humbugged?
must we have humbugged?
must you have humbugged?
must they have humbugged? 	must I have been humbugging?
must you have been humbugging?
must he have been humbugging?
must we have been humbugging?
must you have been humbugging?
must they have been humbugging? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I humbug?
mustn't you humbug?
mustn't he humbug?
mustn't we humbug?
mustn't you humbug?
mustn't they humbug? 	mustn't I be humbugging?
mustn't you be humbugging?
mustn't he be humbugging?
mustn't we be humbugging?
mustn't you be humbugging?
mustn't they be humbugging? 	mustn't I have humbugged?
mustn't you have humbugged?
mustn't he have humbugged?
mustn't we have humbugged?
mustn't you have humbugged?
mustn't they have humbugged? 	mustn't I have been humbugging?
mustn't you have been humbugging?
mustn't he have been humbugging?
mustn't we have been humbugging?
mustn't you have been humbugging?
mustn't they have been humbugging?