English verb conjugation
MUST BUFF

Regular verb: buff - buffed - buffed

Affirmation

Simple form	V-ing form
I must buff you must buff he must buff we must buff you must buff they must buff	I must be buffing you must be buffing he must be buffing we must be buffing you must be buffing they must be buffing
Perfect	V-ing perfect
I must have buffed you must have buffed he must have buffed we must have buffed you must have buffed they must have buffed	I must have been buffing you must have been buffing he must have been buffing we must have been buffing you must have been buffing they must have been buffing

Negation

Simple form	V-ing form
I mustn't buff you mustn't buff he mustn't buff we mustn't buff you mustn't buff they mustn't buff	I mustn't be buffing you mustn't be buffing he mustn't be buffing we mustn't be buffing you mustn't be buffing they mustn't be buffing
Perfect	V-ing perfect
I mustn't have buffed you mustn't have buffed he mustn't have buffed we mustn't have buffed you mustn't have buffed they mustn't have buffed	I mustn't have been buffing you mustn't have been buffing he mustn't have been buffing we mustn't have been buffing you mustn't have been buffing they mustn't have been buffing

Interrogative form

Simple form	V-ing form
must I buff? must you buff? must he buff? must we buff? must you buff? must they buff?	must I be buffing? must you be buffing? must he be buffing? must we be buffing? must you be buffing? must they be buffing?
Perfect	V-ing perfect
must I have buffed? must you have buffed? must he have buffed? must we have buffed? must you have buffed? must they have buffed?	must I have been buffing? must you have been buffing? must he have been buffing? must we have been buffing? must you have been buffing? must they have been buffing?

Interro-negative form

Simple form	V-ing form
mustn't I buff? mustn't you buff? mustn't he buff? mustn't we buff? mustn't you buff? mustn't they buff?	mustn't I be buffing? mustn't you be buffing? mustn't he be buffing? mustn't we be buffing? mustn't you be buffing? mustn't they be buffing?
Perfect	V-ing perfect
mustn't I have buffed? mustn't you have buffed? mustn't he have buffed? mustn't we have buffed? mustn't you have buffed? mustn't they have buffed?	mustn't I have been buffing? mustn't you have been buffing? mustn't he have been buffing? mustn't we have been buffing? mustn't you have been buffing? mustn't they have been buffing?