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 must not buff you must not buff he must not buff we must not buff you must not buff they must not buff	I must not be buffing you must not be buffing he must not be buffing we must not be buffing you must not be buffing they must not be buffing
Perfect	V-ing perfect
I must not have buffed you must not have buffed he must not have buffed we must not have buffed you must not have buffed they must not have buffed	I must not have been buffing you must not have been buffing he must not have been buffing we must not have been buffing you must not have been buffing they must not 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
must I not buff? must you not buff? must he not buff? must we not buff? must you not buff? must they not buff?	must I not be buffing? must you not be buffing? must he not be buffing? must we not be buffing? must you not be buffing? must they not be buffing?
Perfect	V-ing perfect
must I not have buffed? must you not have buffed? must he not have buffed? must we not have buffed? must you not have buffed? must they not have buffed?	must I not have been buffing? must you not have been buffing? must he not have been buffing? must we not have been buffing? must you not have been buffing? must they not have been buffing?