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