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