must affix
Regular verb: affix - affixed- affixed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must affix
you must affix
he must affix
we must affix
you must affix
they must affix 	I must be affixing
you must be affixing
he must be affixing
we must be affixing
you must be affixing
they must be affixing	I must have affixed
you must have affixed
he must have affixed
we must have affixed
you must have affixed
they must have affixed	I must have been affixing
you must have been affixing
he must have been affixing
we must have been affixing
you must have been affixing
they must have been affixing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't affix
you mustn't affix
he mustn't affix
we mustn't affix
you mustn't affix
they mustn't affix 	I mustn't be affixing
you mustn't be affixing
he mustn't be affixing
we mustn't be affixing
you mustn't be affixing
they mustn't be affixing	I mustn't have affixed
you mustn't have affixed
he mustn't have affixed
we mustn't have affixed
you mustn't have affixed
they mustn't have affixed	I mustn't have been affixing
you mustn't have been affixing
he mustn't have been affixing
we mustn't have been affixing
you mustn't have been affixing
they mustn't have been affixing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I affix?
must you affix?
must he affix?
must we affix?
must you affix?
must they affix? 	must I be affixing?
must you be affixing?
must he be affixing?
must we be affixing?
must you be affixing?
must they be affixing? 	must I have affixed?
must you have affixed?
must he have affixed?
must we have affixed?
must you have affixed?
must they have affixed? 	must I have been affixing?
must you have been affixing?
must he have been affixing?
must we have been affixing?
must you have been affixing?
must they have been affixing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I affix?
mustn't you affix?
mustn't he affix?
mustn't we affix?
mustn't you affix?
mustn't they affix? 	mustn't I be affixing?
mustn't you be affixing?
mustn't he be affixing?
mustn't we be affixing?
mustn't you be affixing?
mustn't they be affixing? 	mustn't I have affixed?
mustn't you have affixed?
mustn't he have affixed?
mustn't we have affixed?
mustn't you have affixed?
mustn't they have affixed? 	mustn't I have been affixing?
mustn't you have been affixing?
mustn't he have been affixing?
mustn't we have been affixing?
mustn't you have been affixing?
mustn't they have been affixing?