English verb conjugation
MUST AFFIX

Regular verb: affix - affixed - affixed

Affirmation

Simple form	V-ing form
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
Perfect	V-ing 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	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
I must not affix you must not affix he must not affix we must not affix you must not affix they must not affix	I must not be affixing you must not be affixing he must not be affixing we must not be affixing you must not be affixing they must not be affixing
Perfect	V-ing perfect
I must not have affixed you must not have affixed he must not have affixed we must not have affixed you must not have affixed they must not have affixed	I must not have been affixing you must not have been affixing he must not have been affixing we must not have been affixing you must not have been affixing they must not have been affixing

Interrogative form

Simple form	V-ing form
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?
Perfect	V-ing 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?	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
must I not affix? must you not affix? must he not affix? must we not affix? must you not affix? must they not affix?	must I not be affixing? must you not be affixing? must he not be affixing? must we not be affixing? must you not be affixing? must they not be affixing?
Perfect	V-ing perfect
must I not have affixed? must you not have affixed? must he not have affixed? must we not have affixed? must you not have affixed? must they not have affixed?	must I not have been affixing? must you not have been affixing? must he not have been affixing? must we not have been affixing? must you not have been affixing? must they not have been affixing?