must vex
Regular verb: vex - vexed- vexed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must vex
you must vex
he must vex
we must vex
you must vex
they must vex 	I must be vexing
you must be vexing
he must be vexing
we must be vexing
you must be vexing
they must be vexing	I must have vexed
you must have vexed
he must have vexed
we must have vexed
you must have vexed
they must have vexed	I must have been vexing
you must have been vexing
he must have been vexing
we must have been vexing
you must have been vexing
they must have been vexing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't vex
you mustn't vex
he mustn't vex
we mustn't vex
you mustn't vex
they mustn't vex 	I mustn't be vexing
you mustn't be vexing
he mustn't be vexing
we mustn't be vexing
you mustn't be vexing
they mustn't be vexing	I mustn't have vexed
you mustn't have vexed
he mustn't have vexed
we mustn't have vexed
you mustn't have vexed
they mustn't have vexed	I mustn't have been vexing
you mustn't have been vexing
he mustn't have been vexing
we mustn't have been vexing
you mustn't have been vexing
they mustn't have been vexing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I vex?
must you vex?
must he vex?
must we vex?
must you vex?
must they vex? 	must I be vexing?
must you be vexing?
must he be vexing?
must we be vexing?
must you be vexing?
must they be vexing? 	must I have vexed?
must you have vexed?
must he have vexed?
must we have vexed?
must you have vexed?
must they have vexed? 	must I have been vexing?
must you have been vexing?
must he have been vexing?
must we have been vexing?
must you have been vexing?
must they have been vexing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I vex?
mustn't you vex?
mustn't he vex?
mustn't we vex?
mustn't you vex?
mustn't they vex? 	mustn't I be vexing?
mustn't you be vexing?
mustn't he be vexing?
mustn't we be vexing?
mustn't you be vexing?
mustn't they be vexing? 	mustn't I have vexed?
mustn't you have vexed?
mustn't he have vexed?
mustn't we have vexed?
mustn't you have vexed?
mustn't they have vexed? 	mustn't I have been vexing?
mustn't you have been vexing?
mustn't he have been vexing?
mustn't we have been vexing?
mustn't you have been vexing?
mustn't they have been vexing?