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