I must reign you must reign she must reign we must reign you must reign they must reign
V-ing form
I must be reigning you must be reigning she must be reigning we must be reigning you must be reigning they must be reigning
Perfect
I must have reigned you must have reigned she 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 she 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 she 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 she 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 she 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 she 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 she reign? must we reign? must you reign? must they reign?
V-ing form
must I be reigning? must you be reigning? must she be reigning? must we be reigning? must you be reigning? must they be reigning?
Perfect
must I have reigned? must you have reigned? must she 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 she 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 she 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 she 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 she 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 she have been reigning? mustn't we have been reigning? mustn't you have been reigning? mustn't they have been reigning?