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