must rolf
Regular verb: rolf - rolfed- rolfed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must rolf
you must rolf
he must rolf
we must rolf
you must rolf
they must rolf 	I must be rolfing
you must be rolfing
he must be rolfing
we must be rolfing
you must be rolfing
they must be rolfing	I must have rolfed
you must have rolfed
he must have rolfed
we must have rolfed
you must have rolfed
they must have rolfed	I must have been rolfing
you must have been rolfing
he must have been rolfing
we must have been rolfing
you must have been rolfing
they must have been rolfing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't rolf
you mustn't rolf
he mustn't rolf
we mustn't rolf
you mustn't rolf
they mustn't rolf 	I mustn't be rolfing
you mustn't be rolfing
he mustn't be rolfing
we mustn't be rolfing
you mustn't be rolfing
they mustn't be rolfing	I mustn't have rolfed
you mustn't have rolfed
he mustn't have rolfed
we mustn't have rolfed
you mustn't have rolfed
they mustn't have rolfed	I mustn't have been rolfing
you mustn't have been rolfing
he mustn't have been rolfing
we mustn't have been rolfing
you mustn't have been rolfing
they mustn't have been rolfing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I rolf?
must you rolf?
must he rolf?
must we rolf?
must you rolf?
must they rolf? 	must I be rolfing?
must you be rolfing?
must he be rolfing?
must we be rolfing?
must you be rolfing?
must they be rolfing? 	must I have rolfed?
must you have rolfed?
must he have rolfed?
must we have rolfed?
must you have rolfed?
must they have rolfed? 	must I have been rolfing?
must you have been rolfing?
must he have been rolfing?
must we have been rolfing?
must you have been rolfing?
must they have been rolfing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I rolf?
mustn't you rolf?
mustn't he rolf?
mustn't we rolf?
mustn't you rolf?
mustn't they rolf? 	mustn't I be rolfing?
mustn't you be rolfing?
mustn't he be rolfing?
mustn't we be rolfing?
mustn't you be rolfing?
mustn't they be rolfing? 	mustn't I have rolfed?
mustn't you have rolfed?
mustn't he have rolfed?
mustn't we have rolfed?
mustn't you have rolfed?
mustn't they have rolfed? 	mustn't I have been rolfing?
mustn't you have been rolfing?
mustn't he have been rolfing?
mustn't we have been rolfing?
mustn't you have been rolfing?
mustn't they have been rolfing?