must hum
Regular verb: hum - humed- humed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must hum
you must hum
he must hum
we must hum
you must hum
they must hum 	I must be huming
you must be huming
he must be huming
we must be huming
you must be huming
they must be huming	I must have humed
you must have humed
he must have humed
we must have humed
you must have humed
they must have humed	I must have been huming
you must have been huming
he must have been huming
we must have been huming
you must have been huming
they must have been huming	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not hum
you must not hum
he must not hum
we must not hum
you must not hum
they must not hum 	I must not be huming
you must not be huming
he must not be huming
we must not be huming
you must not be huming
they must not be huming	I must not have humed
you must not have humed
he must not have humed
we must not have humed
you must not have humed
they must not have humed	I must not have been huming
you must not have been huming
he must not have been huming
we must not have been huming
you must not have been huming
they must not have been huming	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I hum?
must you hum?
must he hum?
must we hum?
must you hum?
must they hum? 	must I be huming?
must you be huming?
must he be huming?
must we be huming?
must you be huming?
must they be huming? 	must I have humed?
must you have humed?
must he have humed?
must we have humed?
must you have humed?
must they have humed? 	must I have been huming?
must you have been huming?
must he have been huming?
must we have been huming?
must you have been huming?
must they have been huming? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not hum?
must you not hum?
must he not hum?
must we not hum?
must you not hum?
must they not hum? 	must I not be huming?
must you not be huming?
must he not be huming?
must we not be huming?
must you not be huming?
must they not be huming? 	must I not have humed?
must you not have humed?
must he not have humed?
must we not have humed?
must you not have humed?
must they not have humed? 	must I not have been huming?
must you not have been huming?
must he not have been huming?
must we not have been huming?
must you not have been huming?
must they not have been huming?