must betray
Regular verb: betray - betrayed- betrayed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must betray
you must betray
he must betray
we must betray
you must betray
they must betray 	I must be betraying
you must be betraying
he must be betraying
we must be betraying
you must be betraying
they must be betraying	I must have betrayed
you must have betrayed
he must have betrayed
we must have betrayed
you must have betrayed
they must have betrayed	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 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't betray
you mustn't betray
he mustn't betray
we mustn't betray
you mustn't betray
they mustn't betray 	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	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	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 	V-ing form 	Perfect 	V-ing perfect 	
must I betray?
must you betray?
must he betray?
must we betray?
must you betray?
must they betray? 	must I be betraying?
must you be betraying?
must he be betraying?
must we be betraying?
must you be betraying?
must they be betraying? 	must I have betrayed?
must you have betrayed?
must he have betrayed?
must we have betrayed?
must you have betrayed?
must they have betrayed? 	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 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I betray?
mustn't you betray?
mustn't he betray?
mustn't we betray?
mustn't you betray?
mustn't they betray? 	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? 	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? 	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?