must humidify
Regular verb: humidify - humidified- humidified

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must humidify
you must humidify
he must humidify
we must humidify
you must humidify
they must humidify 	I must be humidifying
you must be humidifying
he must be humidifying
we must be humidifying
you must be humidifying
they must be humidifying	I must have humidified
you must have humidified
he must have humidified
we must have humidified
you must have humidified
they must have humidified	I must have been humidifying
you must have been humidifying
he must have been humidifying
we must have been humidifying
you must have been humidifying
they must have been humidifying	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not humidify
you must not humidify
he must not humidify
we must not humidify
you must not humidify
they must not humidify 	I must not be humidifying
you must not be humidifying
he must not be humidifying
we must not be humidifying
you must not be humidifying
they must not be humidifying	I must not have humidified
you must not have humidified
he must not have humidified
we must not have humidified
you must not have humidified
they must not have humidified	I must not have been humidifying
you must not have been humidifying
he must not have been humidifying
we must not have been humidifying
you must not have been humidifying
they must not have been humidifying	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I humidify?
must you humidify?
must he humidify?
must we humidify?
must you humidify?
must they humidify? 	must I be humidifying?
must you be humidifying?
must he be humidifying?
must we be humidifying?
must you be humidifying?
must they be humidifying? 	must I have humidified?
must you have humidified?
must he have humidified?
must we have humidified?
must you have humidified?
must they have humidified? 	must I have been humidifying?
must you have been humidifying?
must he have been humidifying?
must we have been humidifying?
must you have been humidifying?
must they have been humidifying? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not humidify?
must you not humidify?
must he not humidify?
must we not humidify?
must you not humidify?
must they not humidify? 	must I not be humidifying?
must you not be humidifying?
must he not be humidifying?
must we not be humidifying?
must you not be humidifying?
must they not be humidifying? 	must I not have humidified?
must you not have humidified?
must he not have humidified?
must we not have humidified?
must you not have humidified?
must they not have humidified? 	must I not have been humidifying?
must you not have been humidifying?
must he not have been humidifying?
must we not have been humidifying?
must you not have been humidifying?
must they not have been humidifying?