must vibrate
Regular verb: vibrate - vibrated- vibrated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must vibrate
you must vibrate
he must vibrate
we must vibrate
you must vibrate
they must vibrate 	I must be vibrating
you must be vibrating
he must be vibrating
we must be vibrating
you must be vibrating
they must be vibrating	I must have vibrated
you must have vibrated
he must have vibrated
we must have vibrated
you must have vibrated
they must have vibrated	I must have been vibrating
you must have been vibrating
he must have been vibrating
we must have been vibrating
you must have been vibrating
they must have been vibrating	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't vibrate
you mustn't vibrate
he mustn't vibrate
we mustn't vibrate
you mustn't vibrate
they mustn't vibrate 	I mustn't be vibrating
you mustn't be vibrating
he mustn't be vibrating
we mustn't be vibrating
you mustn't be vibrating
they mustn't be vibrating	I mustn't have vibrated
you mustn't have vibrated
he mustn't have vibrated
we mustn't have vibrated
you mustn't have vibrated
they mustn't have vibrated	I mustn't have been vibrating
you mustn't have been vibrating
he mustn't have been vibrating
we mustn't have been vibrating
you mustn't have been vibrating
they mustn't have been vibrating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I vibrate?
must you vibrate?
must he vibrate?
must we vibrate?
must you vibrate?
must they vibrate? 	must I be vibrating?
must you be vibrating?
must he be vibrating?
must we be vibrating?
must you be vibrating?
must they be vibrating? 	must I have vibrated?
must you have vibrated?
must he have vibrated?
must we have vibrated?
must you have vibrated?
must they have vibrated? 	must I have been vibrating?
must you have been vibrating?
must he have been vibrating?
must we have been vibrating?
must you have been vibrating?
must they have been vibrating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I vibrate?
mustn't you vibrate?
mustn't he vibrate?
mustn't we vibrate?
mustn't you vibrate?
mustn't they vibrate? 	mustn't I be vibrating?
mustn't you be vibrating?
mustn't he be vibrating?
mustn't we be vibrating?
mustn't you be vibrating?
mustn't they be vibrating? 	mustn't I have vibrated?
mustn't you have vibrated?
mustn't he have vibrated?
mustn't we have vibrated?
mustn't you have vibrated?
mustn't they have vibrated? 	mustn't I have been vibrating?
mustn't you have been vibrating?
mustn't he have been vibrating?
mustn't we have been vibrating?
mustn't you have been vibrating?
mustn't they have been vibrating?