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 mustn't humidify
you mustn't humidify
he mustn't humidify
we mustn't humidify
you mustn't humidify
they mustn't humidify 	I mustn't be humidifying
you mustn't be humidifying
he mustn't be humidifying
we mustn't be humidifying
you mustn't be humidifying
they mustn't be humidifying	I mustn't have humidified
you mustn't have humidified
he mustn't have humidified
we mustn't have humidified
you mustn't have humidified
they mustn't have humidified	I mustn't have been humidifying
you mustn't have been humidifying
he mustn't have been humidifying
we mustn't have been humidifying
you mustn't have been humidifying
they mustn't 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 	
mustn't I humidify?
mustn't you humidify?
mustn't he humidify?
mustn't we humidify?
mustn't you humidify?
mustn't they humidify? 	mustn't I be humidifying?
mustn't you be humidifying?
mustn't he be humidifying?
mustn't we be humidifying?
mustn't you be humidifying?
mustn't they be humidifying? 	mustn't I have humidified?
mustn't you have humidified?
mustn't he have humidified?
mustn't we have humidified?
mustn't you have humidified?
mustn't they have humidified? 	mustn't I have been humidifying?
mustn't you have been humidifying?
mustn't he have been humidifying?
mustn't we have been humidifying?
mustn't you have been humidifying?
mustn't they have been humidifying?