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 must not vibrate
you must not vibrate
he must not vibrate
we must not vibrate
you must not vibrate
they must not vibrate 	I must not be vibrating
you must not be vibrating
he must not be vibrating
we must not be vibrating
you must not be vibrating
they must not be vibrating	I must not have vibrated
you must not have vibrated
he must not have vibrated
we must not have vibrated
you must not have vibrated
they must not have vibrated	I must not have been vibrating
you must not have been vibrating
he must not have been vibrating
we must not have been vibrating
you must not have been vibrating
they must not 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 	
must I not vibrate?
must you not vibrate?
must he not vibrate?
must we not vibrate?
must you not vibrate?
must they not vibrate? 	must I not be vibrating?
must you not be vibrating?
must he not be vibrating?
must we not be vibrating?
must you not be vibrating?
must they not be vibrating? 	must I not have vibrated?
must you not have vibrated?
must he not have vibrated?
must we not have vibrated?
must you not have vibrated?
must they not have vibrated? 	must I not have been vibrating?
must you not have been vibrating?
must he not have been vibrating?
must we not have been vibrating?
must you not have been vibrating?
must they not have been vibrating?