must affix
Regular verb: affix - affixed- affixed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must affix
you must affix
she must affix
we must affix
you must affix
they must affix 	I must be affixing
you must be affixing
she must be affixing
we must be affixing
you must be affixing
they must be affixing	I must have affixed
you must have affixed
she 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
she 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
she 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
she 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
she 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
she 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 she affix?
must we affix?
must you affix?
must they affix? 	must I be affixing?
must you be affixing?
must she be affixing?
must we be affixing?
must you be affixing?
must they be affixing? 	must I have affixed?
must you have affixed?
must she 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 she 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 she 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 she 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 she 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 she have been affixing?
mustn't we have been affixing?
mustn't you have been affixing?
mustn't they have been affixing?