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