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 mustn't overstaff you mustn't overstaff he mustn't overstaff we mustn't overstaff you mustn't overstaff they mustn't overstaff	I mustn't be overstaffing you mustn't be overstaffing he mustn't be overstaffing we mustn't be overstaffing you mustn't be overstaffing they mustn't be overstaffing
Perfect	V-ing perfect
I mustn't have overstaffed you mustn't have overstaffed he mustn't have overstaffed we mustn't have overstaffed you mustn't have overstaffed they mustn't have overstaffed	I mustn't have been overstaffing you mustn't have been overstaffing he mustn't have been overstaffing we mustn't have been overstaffing you mustn't have been overstaffing they mustn't 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
mustn't I overstaff? mustn't you overstaff? mustn't he overstaff? mustn't we overstaff? mustn't you overstaff? mustn't they overstaff?	mustn't I be overstaffing? mustn't you be overstaffing? mustn't he be overstaffing? mustn't we be overstaffing? mustn't you be overstaffing? mustn't they be overstaffing?
Perfect	V-ing perfect
mustn't I have overstaffed? mustn't you have overstaffed? mustn't he have overstaffed? mustn't we have overstaffed? mustn't you have overstaffed? mustn't they have overstaffed?	mustn't I have been overstaffing? mustn't you have been overstaffing? mustn't he have been overstaffing? mustn't we have been overstaffing? mustn't you have been overstaffing? mustn't they have been overstaffing?