English verb conjugation
MUST BUZZ

Regular verb: buzz - buzzed - buzzed

Affirmation

Simple form	V-ing form
I must buzz you must buzz he must buzz we must buzz you must buzz they must buzz	I must be buzzing you must be buzzing he must be buzzing we must be buzzing you must be buzzing they must be buzzing
Perfect	V-ing perfect
I must have buzzed you must have buzzed he must have buzzed we must have buzzed you must have buzzed they must have buzzed	I must have been buzzing you must have been buzzing he must have been buzzing we must have been buzzing you must have been buzzing they must have been buzzing

Negation

Simple form	V-ing form
I must not buzz you must not buzz he must not buzz we must not buzz you must not buzz they must not buzz	I must not be buzzing you must not be buzzing he must not be buzzing we must not be buzzing you must not be buzzing they must not be buzzing
Perfect	V-ing perfect
I must not have buzzed you must not have buzzed he must not have buzzed we must not have buzzed you must not have buzzed they must not have buzzed	I must not have been buzzing you must not have been buzzing he must not have been buzzing we must not have been buzzing you must not have been buzzing they must not have been buzzing

Interrogative form

Simple form	V-ing form
must I buzz? must you buzz? must he buzz? must we buzz? must you buzz? must they buzz?	must I be buzzing? must you be buzzing? must he be buzzing? must we be buzzing? must you be buzzing? must they be buzzing?
Perfect	V-ing perfect
must I have buzzed? must you have buzzed? must he have buzzed? must we have buzzed? must you have buzzed? must they have buzzed?	must I have been buzzing? must you have been buzzing? must he have been buzzing? must we have been buzzing? must you have been buzzing? must they have been buzzing?

Interro-negative form

Simple form	V-ing form
must I not buzz? must you not buzz? must he not buzz? must we not buzz? must you not buzz? must they not buzz?	must I not be buzzing? must you not be buzzing? must he not be buzzing? must we not be buzzing? must you not be buzzing? must they not be buzzing?
Perfect	V-ing perfect
must I not have buzzed? must you not have buzzed? must he not have buzzed? must we not have buzzed? must you not have buzzed? must they not have buzzed?	must I not have been buzzing? must you not have been buzzing? must he not have been buzzing? must we not have been buzzing? must you not have been buzzing? must they not have been buzzing?