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