I must shut you must shut she must shut we must shut you must shut they must shut
V-ing form
I must be shutting you must be shutting she must be shutting we must be shutting you must be shutting they must be shutting
Perfect
I must have shut you must have shut she 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 she must have been shutting we must have been shutting you must have been shutting they must have been shutting
Negation
Simple form
I must not shut you must not shut she must not shut we must not shut you must not shut they must not shut
V-ing form
I must not be shutting you must not be shutting she must not be shutting we must not be shutting you must not be shutting they must not be shutting
Perfect
I must not have shut you must not have shut she must not have shut we must not have shut you must not have shut they must not have shut
V-ing perfect
I must not have been shutting you must not have been shutting she must not have been shutting we must not have been shutting you must not have been shutting they must not have been shutting
Interrogative form
Simple form
must I shut? must you shut? must she shut? must we shut? must you shut? must they shut?
V-ing form
must I be shutting? must you be shutting? must she be shutting? must we be shutting? must you be shutting? must they be shutting?
Perfect
must I have shut? must you have shut? must she 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 she have been shutting? must we have been shutting? must you have been shutting? must they have been shutting?
Interro-negative form
Simple form
must I not shut? must you not shut? must she not shut? must we not shut? must you not shut? must they not shut?
V-ing form
must I not be shutting? must you not be shutting? must she not be shutting? must we not be shutting? must you not be shutting? must they not be shutting?
Perfect
must I not have shut? must you not have shut? must she not have shut? must we not have shut? must you not have shut? must they not have shut?
V-ing perfect
must I not have been shutting? must you not have been shutting? must she not have been shutting? must we not have been shutting? must you not have been shutting? must they not have been shutting?