English verb conjugation
MUST PREFIX

Regular verb: prefix - prefixed - prefixed

Affirmation

Simple form	V-ing form
I must prefix you must prefix he must prefix we must prefix you must prefix they must prefix	I must be prefixing you must be prefixing he must be prefixing we must be prefixing you must be prefixing they must be prefixing
Perfect	V-ing perfect
I must have prefixed you must have prefixed he must have prefixed we must have prefixed you must have prefixed they must have prefixed	I must have been prefixing you must have been prefixing he must have been prefixing we must have been prefixing you must have been prefixing they must have been prefixing

Negation

Simple form	V-ing form
I mustn't prefix you mustn't prefix he mustn't prefix we mustn't prefix you mustn't prefix they mustn't prefix	I mustn't be prefixing you mustn't be prefixing he mustn't be prefixing we mustn't be prefixing you mustn't be prefixing they mustn't be prefixing
Perfect	V-ing perfect
I mustn't have prefixed you mustn't have prefixed he mustn't have prefixed we mustn't have prefixed you mustn't have prefixed they mustn't have prefixed	I mustn't have been prefixing you mustn't have been prefixing he mustn't have been prefixing we mustn't have been prefixing you mustn't have been prefixing they mustn't have been prefixing

Interrogative form

Simple form	V-ing form
must I prefix? must you prefix? must he prefix? must we prefix? must you prefix? must they prefix?	must I be prefixing? must you be prefixing? must he be prefixing? must we be prefixing? must you be prefixing? must they be prefixing?
Perfect	V-ing perfect
must I have prefixed? must you have prefixed? must he have prefixed? must we have prefixed? must you have prefixed? must they have prefixed?	must I have been prefixing? must you have been prefixing? must he have been prefixing? must we have been prefixing? must you have been prefixing? must they have been prefixing?

Interro-negative form

Simple form	V-ing form
mustn't I prefix? mustn't you prefix? mustn't he prefix? mustn't we prefix? mustn't you prefix? mustn't they prefix?	mustn't I be prefixing? mustn't you be prefixing? mustn't he be prefixing? mustn't we be prefixing? mustn't you be prefixing? mustn't they be prefixing?
Perfect	V-ing perfect
mustn't I have prefixed? mustn't you have prefixed? mustn't he have prefixed? mustn't we have prefixed? mustn't you have prefixed? mustn't they have prefixed?	mustn't I have been prefixing? mustn't you have been prefixing? mustn't he have been prefixing? mustn't we have been prefixing? mustn't you have been prefixing? mustn't they have been prefixing?