must avenge
Regular verb: avenge - avenged- avenged

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must avenge
you must avenge
he must avenge
we must avenge
you must avenge
they must avenge 	I must be avenging
you must be avenging
he must be avenging
we must be avenging
you must be avenging
they must be avenging	I must have avenged
you must have avenged
he must have avenged
we must have avenged
you must have avenged
they must have avenged	I must have been avenging
you must have been avenging
he must have been avenging
we must have been avenging
you must have been avenging
they must have been avenging	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't avenge
you mustn't avenge
he mustn't avenge
we mustn't avenge
you mustn't avenge
they mustn't avenge 	I mustn't be avenging
you mustn't be avenging
he mustn't be avenging
we mustn't be avenging
you mustn't be avenging
they mustn't be avenging	I mustn't have avenged
you mustn't have avenged
he mustn't have avenged
we mustn't have avenged
you mustn't have avenged
they mustn't have avenged	I mustn't have been avenging
you mustn't have been avenging
he mustn't have been avenging
we mustn't have been avenging
you mustn't have been avenging
they mustn't have been avenging	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I avenge?
must you avenge?
must he avenge?
must we avenge?
must you avenge?
must they avenge? 	must I be avenging?
must you be avenging?
must he be avenging?
must we be avenging?
must you be avenging?
must they be avenging? 	must I have avenged?
must you have avenged?
must he have avenged?
must we have avenged?
must you have avenged?
must they have avenged? 	must I have been avenging?
must you have been avenging?
must he have been avenging?
must we have been avenging?
must you have been avenging?
must they have been avenging? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I avenge?
mustn't you avenge?
mustn't he avenge?
mustn't we avenge?
mustn't you avenge?
mustn't they avenge? 	mustn't I be avenging?
mustn't you be avenging?
mustn't he be avenging?
mustn't we be avenging?
mustn't you be avenging?
mustn't they be avenging? 	mustn't I have avenged?
mustn't you have avenged?
mustn't he have avenged?
mustn't we have avenged?
mustn't you have avenged?
mustn't they have avenged? 	mustn't I have been avenging?
mustn't you have been avenging?
mustn't he have been avenging?
mustn't we have been avenging?
mustn't you have been avenging?
mustn't they have been avenging?