English verb conjugation
COULD STAFF

Regular verb: staff - staffed - staffed

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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