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 must not humbug
you must not humbug
he must not humbug
we must not humbug
you must not humbug
they must not humbug 	I must not be humbugging
you must not be humbugging
he must not be humbugging
we must not be humbugging
you must not be humbugging
they must not be humbugging	I must not have humbugged
you must not have humbugged
he must not have humbugged
we must not have humbugged
you must not have humbugged
they must not have humbugged	I must not have been humbugging
you must not have been humbugging
he must not have been humbugging
we must not have been humbugging
you must not have been humbugging
they must not 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 	
must I not humbug?
must you not humbug?
must he not humbug?
must we not humbug?
must you not humbug?
must they not humbug? 	must I not be humbugging?
must you not be humbugging?
must he not be humbugging?
must we not be humbugging?
must you not be humbugging?
must they not be humbugging? 	must I not have humbugged?
must you not have humbugged?
must he not have humbugged?
must we not have humbugged?
must you not have humbugged?
must they not have humbugged? 	must I not have been humbugging?
must you not have been humbugging?
must he not have been humbugging?
must we not have been humbugging?
must you not have been humbugging?
must they not have been humbugging?