I must regale you must regale she must regale we must regale you must regale they must regale
V-ing form
I must be regaling you must be regaling she must be regaling we must be regaling you must be regaling they must be regaling
Perfect
I must have regaled you must have regaled she must have regaled we must have regaled you must have regaled they must have regaled
V-ing perfect
I must have been regaling you must have been regaling she must have been regaling we must have been regaling you must have been regaling they must have been regaling
Negation
Simple form
I mustn't regale you mustn't regale she mustn't regale we mustn't regale you mustn't regale they mustn't regale
V-ing form
I mustn't be regaling you mustn't be regaling she mustn't be regaling we mustn't be regaling you mustn't be regaling they mustn't be regaling
Perfect
I mustn't have regaled you mustn't have regaled she mustn't have regaled we mustn't have regaled you mustn't have regaled they mustn't have regaled
V-ing perfect
I mustn't have been regaling you mustn't have been regaling she mustn't have been regaling we mustn't have been regaling you mustn't have been regaling they mustn't have been regaling
Interrogative form
Simple form
must I regale? must you regale? must she regale? must we regale? must you regale? must they regale?
V-ing form
must I be regaling? must you be regaling? must she be regaling? must we be regaling? must you be regaling? must they be regaling?
Perfect
must I have regaled? must you have regaled? must she have regaled? must we have regaled? must you have regaled? must they have regaled?
V-ing perfect
must I have been regaling? must you have been regaling? must she have been regaling? must we have been regaling? must you have been regaling? must they have been regaling?
Interro-negative form
Simple form
mustn't I regale? mustn't you regale? mustn't she regale? mustn't we regale? mustn't you regale? mustn't they regale?
V-ing form
mustn't I be regaling? mustn't you be regaling? mustn't she be regaling? mustn't we be regaling? mustn't you be regaling? mustn't they be regaling?
Perfect
mustn't I have regaled? mustn't you have regaled? mustn't she have regaled? mustn't we have regaled? mustn't you have regaled? mustn't they have regaled?
V-ing perfect
mustn't I have been regaling? mustn't you have been regaling? mustn't she have been regaling? mustn't we have been regaling? mustn't you have been regaling? mustn't they have been regaling?