I must regiment you must regiment he must regiment we must regiment you must regiment they must regiment
V-ing form
I must be regimenting you must be regimenting he must be regimenting we must be regimenting you must be regimenting they must be regimenting
Perfect
I must have regimented you must have regimented he must have regimented we must have regimented you must have regimented they must have regimented
V-ing perfect
I must have been regimenting you must have been regimenting he must have been regimenting we must have been regimenting you must have been regimenting they must have been regimenting
Negation
Simple form
I mustn't regiment you mustn't regiment he mustn't regiment we mustn't regiment you mustn't regiment they mustn't regiment
V-ing form
I mustn't be regimenting you mustn't be regimenting he mustn't be regimenting we mustn't be regimenting you mustn't be regimenting they mustn't be regimenting
Perfect
I mustn't have regimented you mustn't have regimented he mustn't have regimented we mustn't have regimented you mustn't have regimented they mustn't have regimented
V-ing perfect
I mustn't have been regimenting you mustn't have been regimenting he mustn't have been regimenting we mustn't have been regimenting you mustn't have been regimenting they mustn't have been regimenting
Interrogative form
Simple form
must I regiment? must you regiment? must he regiment? must we regiment? must you regiment? must they regiment?
V-ing form
must I be regimenting? must you be regimenting? must he be regimenting? must we be regimenting? must you be regimenting? must they be regimenting?
Perfect
must I have regimented? must you have regimented? must he have regimented? must we have regimented? must you have regimented? must they have regimented?
V-ing perfect
must I have been regimenting? must you have been regimenting? must he have been regimenting? must we have been regimenting? must you have been regimenting? must they have been regimenting?
Interro-negative form
Simple form
mustn't I regiment? mustn't you regiment? mustn't he regiment? mustn't we regiment? mustn't you regiment? mustn't they regiment?
V-ing form
mustn't I be regimenting? mustn't you be regimenting? mustn't he be regimenting? mustn't we be regimenting? mustn't you be regimenting? mustn't they be regimenting?
Perfect
mustn't I have regimented? mustn't you have regimented? mustn't he have regimented? mustn't we have regimented? mustn't you have regimented? mustn't they have regimented?
V-ing perfect
mustn't I have been regimenting? mustn't you have been regimenting? mustn't he have been regimenting? mustn't we have been regimenting? mustn't you have been regimenting? mustn't they have been regimenting?