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