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