English verb conjugation
MUST ROLF

Regular verb: rolf - rolfed - rolfed

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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
I must not rolf you must not rolf he must not rolf we must not rolf you must not rolf they must not rolf	I must not be rolfing you must not be rolfing he must not be rolfing we must not be rolfing you must not be rolfing they must not be rolfing
Perfect	V-ing perfect
I must not have rolfed you must not have rolfed he must not have rolfed we must not have rolfed you must not have rolfed they must not have rolfed	I must not have been rolfing you must not have been rolfing he must not have been rolfing we must not have been rolfing you must not have been rolfing they must not have been rolfing

Interrogative form

Simple form	V-ing form
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?
Perfect	V-ing perfect
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
must I not rolf? must you not rolf? must he not rolf? must we not rolf? must you not rolf? must they not rolf?	must I not be rolfing? must you not be rolfing? must he not be rolfing? must we not be rolfing? must you not be rolfing? must they not be rolfing?
Perfect	V-ing perfect
must I not have rolfed? must you not have rolfed? must he not have rolfed? must we not have rolfed? must you not have rolfed? must they not have rolfed?	must I not have been rolfing? must you not have been rolfing? must he not have been rolfing? must we not have been rolfing? must you not have been rolfing? must they not have been rolfing?