English verb conjugation
COULD OVERSTAFF

Regular verb: overstaff - overstaffed - overstaffed

Affirmation

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

Negation

Simple form	V-ing form
I couldn't overstaff you couldn't overstaff he couldn't overstaff we couldn't overstaff you couldn't overstaff they couldn't overstaff	I couldn't be overstaffing you couldn't be overstaffing he couldn't be overstaffing we couldn't be overstaffing you couldn't be overstaffing they couldn't be overstaffing
Perfect	V-ing perfect
I couldn't have overstaffed you couldn't have overstaffed he couldn't have overstaffed we couldn't have overstaffed you couldn't have overstaffed they couldn't have overstaffed	I couldn't have been overstaffing you couldn't have been overstaffing he couldn't have been overstaffing we couldn't have been overstaffing you couldn't have been overstaffing they couldn't have been overstaffing

Interrogative form

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

Interro-negative form

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