must hyphen
Regular verb: hyphen - hyphened- hyphened

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must hyphen
you must hyphen
he must hyphen
we must hyphen
you must hyphen
they must hyphen 	I must be hyphening
you must be hyphening
he must be hyphening
we must be hyphening
you must be hyphening
they must be hyphening	I must have hyphened
you must have hyphened
he must have hyphened
we must have hyphened
you must have hyphened
they must have hyphened	I must have been hyphening
you must have been hyphening
he must have been hyphening
we must have been hyphening
you must have been hyphening
they must have been hyphening	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't hyphen
you mustn't hyphen
he mustn't hyphen
we mustn't hyphen
you mustn't hyphen
they mustn't hyphen 	I mustn't be hyphening
you mustn't be hyphening
he mustn't be hyphening
we mustn't be hyphening
you mustn't be hyphening
they mustn't be hyphening	I mustn't have hyphened
you mustn't have hyphened
he mustn't have hyphened
we mustn't have hyphened
you mustn't have hyphened
they mustn't have hyphened	I mustn't have been hyphening
you mustn't have been hyphening
he mustn't have been hyphening
we mustn't have been hyphening
you mustn't have been hyphening
they mustn't have been hyphening	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I hyphen?
must you hyphen?
must he hyphen?
must we hyphen?
must you hyphen?
must they hyphen? 	must I be hyphening?
must you be hyphening?
must he be hyphening?
must we be hyphening?
must you be hyphening?
must they be hyphening? 	must I have hyphened?
must you have hyphened?
must he have hyphened?
must we have hyphened?
must you have hyphened?
must they have hyphened? 	must I have been hyphening?
must you have been hyphening?
must he have been hyphening?
must we have been hyphening?
must you have been hyphening?
must they have been hyphening? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I hyphen?
mustn't you hyphen?
mustn't he hyphen?
mustn't we hyphen?
mustn't you hyphen?
mustn't they hyphen? 	mustn't I be hyphening?
mustn't you be hyphening?
mustn't he be hyphening?
mustn't we be hyphening?
mustn't you be hyphening?
mustn't they be hyphening? 	mustn't I have hyphened?
mustn't you have hyphened?
mustn't he have hyphened?
mustn't we have hyphened?
mustn't you have hyphened?
mustn't they have hyphened? 	mustn't I have been hyphening?
mustn't you have been hyphening?
mustn't he have been hyphening?
mustn't we have been hyphening?
mustn't you have been hyphening?
mustn't they have been hyphening?