English verb conjugation
MUST STAFF

Regular verb: staff - staffed - staffed

Affirmation

Simple form	V-ing form
I must staff you must staff he must staff we must staff you must staff they must staff	I must be staffing you must be staffing he must be staffing we must be staffing you must be staffing they must be staffing
Perfect	V-ing perfect
I must have staffed you must have staffed he must have staffed we must have staffed you must have staffed they must have staffed	I must have been staffing you must have been staffing he must have been staffing we must have been staffing you must have been staffing they must have been staffing

Negation

Simple form	V-ing form
I must not staff you must not staff he must not staff we must not staff you must not staff they must not staff	I must not be staffing you must not be staffing he must not be staffing we must not be staffing you must not be staffing they must not be staffing
Perfect	V-ing perfect
I must not have staffed you must not have staffed he must not have staffed we must not have staffed you must not have staffed they must not have staffed	I must not have been staffing you must not have been staffing he must not have been staffing we must not have been staffing you must not have been staffing they must not have been staffing

Interrogative form

Simple form	V-ing form
must I staff? must you staff? must he staff? must we staff? must you staff? must they staff?	must I be staffing? must you be staffing? must he be staffing? must we be staffing? must you be staffing? must they be staffing?
Perfect	V-ing perfect
must I have staffed? must you have staffed? must he have staffed? must we have staffed? must you have staffed? must they have staffed?	must I have been staffing? must you have been staffing? must he have been staffing? must we have been staffing? must you have been staffing? must they have been staffing?

Interro-negative form

Simple form	V-ing form
must I not staff? must you not staff? must he not staff? must we not staff? must you not staff? must they not staff?	must I not be staffing? must you not be staffing? must he not be staffing? must we not be staffing? must you not be staffing? must they not be staffing?
Perfect	V-ing perfect
must I not have staffed? must you not have staffed? must he not have staffed? must we not have staffed? must you not have staffed? must they not have staffed?	must I not have been staffing? must you not have been staffing? must he not have been staffing? must we not have been staffing? must you not have been staffing? must they not have been staffing?