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