must vent
Regular verb: vent - vented- vented

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must vent
you must vent
he must vent
we must vent
you must vent
they must vent 	I must be venting
you must be venting
he must be venting
we must be venting
you must be venting
they must be venting	I must have vented
you must have vented
he must have vented
we must have vented
you must have vented
they must have vented	I must have been venting
you must have been venting
he must have been venting
we must have been venting
you must have been venting
they must have been venting	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not vent
you must not vent
he must not vent
we must not vent
you must not vent
they must not vent 	I must not be venting
you must not be venting
he must not be venting
we must not be venting
you must not be venting
they must not be venting	I must not have vented
you must not have vented
he must not have vented
we must not have vented
you must not have vented
they must not have vented	I must not have been venting
you must not have been venting
he must not have been venting
we must not have been venting
you must not have been venting
they must not have been venting	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I vent?
must you vent?
must he vent?
must we vent?
must you vent?
must they vent? 	must I be venting?
must you be venting?
must he be venting?
must we be venting?
must you be venting?
must they be venting? 	must I have vented?
must you have vented?
must he have vented?
must we have vented?
must you have vented?
must they have vented? 	must I have been venting?
must you have been venting?
must he have been venting?
must we have been venting?
must you have been venting?
must they have been venting? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not vent?
must you not vent?
must he not vent?
must we not vent?
must you not vent?
must they not vent? 	must I not be venting?
must you not be venting?
must he not be venting?
must we not be venting?
must you not be venting?
must they not be venting? 	must I not have vented?
must you not have vented?
must he not have vented?
must we not have vented?
must you not have vented?
must they not have vented? 	must I not have been venting?
must you not have been venting?
must he not have been venting?
must we not have been venting?
must you not have been venting?
must they not have been venting?