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