English verb conjugation
MUST BUZZ

Regular verb: buzz - buzzed - buzzed

Affirmation

Simple form	V-ing form
I must buzz you must buzz she must buzz we must buzz you must buzz they must buzz	I must be buzzing you must be buzzing she 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 she 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 she 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 she 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 she 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 she 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 she 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 she buzz? must we buzz? must you buzz? must they buzz?	must I be buzzing? must you be buzzing? must she 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 she 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 she 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 she 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 she 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 she 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 she not have been buzzing? must we not have been buzzing? must you not have been buzzing? must they not have been buzzing?