English verb conjugation
MUST OVERSTAFF

Regular verb: overstaff - overstaffed - overstaffed

Affirmation

Simple form	V-ing form
I must overstaff you must overstaff he must overstaff we must overstaff you must overstaff they must overstaff	I must be overstaffing you must be overstaffing he must be overstaffing we must be overstaffing you must be overstaffing they must be overstaffing
Perfect	V-ing perfect
I must have overstaffed you must have overstaffed he must have overstaffed we must have overstaffed you must have overstaffed they must have overstaffed	I must have been overstaffing you must have been overstaffing he must have been overstaffing we must have been overstaffing you must have been overstaffing they must have been overstaffing

Negation

Simple form	V-ing form
I must not overstaff you must not overstaff he must not overstaff we must not overstaff you must not overstaff they must not overstaff	I must not be overstaffing you must not be overstaffing he must not be overstaffing we must not be overstaffing you must not be overstaffing they must not be overstaffing
Perfect	V-ing perfect
I must not have overstaffed you must not have overstaffed he must not have overstaffed we must not have overstaffed you must not have overstaffed they must not have overstaffed	I must not have been overstaffing you must not have been overstaffing he must not have been overstaffing we must not have been overstaffing you must not have been overstaffing they must not have been overstaffing

Interrogative form

Simple form	V-ing form
must I overstaff? must you overstaff? must he overstaff? must we overstaff? must you overstaff? must they overstaff?	must I be overstaffing? must you be overstaffing? must he be overstaffing? must we be overstaffing? must you be overstaffing? must they be overstaffing?
Perfect	V-ing perfect
must I have overstaffed? must you have overstaffed? must he have overstaffed? must we have overstaffed? must you have overstaffed? must they have overstaffed?	must I have been overstaffing? must you have been overstaffing? must he have been overstaffing? must we have been overstaffing? must you have been overstaffing? must they have been overstaffing?

Interro-negative form

Simple form	V-ing form
must I not overstaff? must you not overstaff? must he not overstaff? must we not overstaff? must you not overstaff? must they not overstaff?	must I not be overstaffing? must you not be overstaffing? must he not be overstaffing? must we not be overstaffing? must you not be overstaffing? must they not be overstaffing?
Perfect	V-ing perfect
must I not have overstaffed? must you not have overstaffed? must he not have overstaffed? must we not have overstaffed? must you not have overstaffed? must they not have overstaffed?	must I not have been overstaffing? must you not have been overstaffing? must he not have been overstaffing? must we not have been overstaffing? must you not have been overstaffing? must they not have been overstaffing?