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