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