must hyphen
Regular verb: hyphen - hyphened- hyphened

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must hyphen
you must hyphen
she must hyphen
we must hyphen
you must hyphen
they must hyphen 	I must be hyphening
you must be hyphening
she must be hyphening
we must be hyphening
you must be hyphening
they must be hyphening	I must have hyphened
you must have hyphened
she 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
she 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
she 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
she 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
she 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
she 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 she hyphen?
must we hyphen?
must you hyphen?
must they hyphen? 	must I be hyphening?
must you be hyphening?
must she be hyphening?
must we be hyphening?
must you be hyphening?
must they be hyphening? 	must I have hyphened?
must you have hyphened?
must she 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 she 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 she 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 she 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 she 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 she have been hyphening?
mustn't we have been hyphening?
mustn't you have been hyphening?
mustn't they have been hyphening?