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 couldn't staff you couldn't staff he couldn't staff we couldn't staff you couldn't staff they couldn't staff	I couldn't be staffing you couldn't be staffing he couldn't be staffing we couldn't be staffing you couldn't be staffing they couldn't be staffing
Perfect	V-ing perfect
I couldn't have staffed you couldn't have staffed he couldn't have staffed we couldn't have staffed you couldn't have staffed they couldn't have staffed	I couldn't have been staffing you couldn't have been staffing he couldn't have been staffing we couldn't have been staffing you couldn't have been staffing they couldn't 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
couldn't I staff? couldn't you staff? couldn't he staff? couldn't we staff? couldn't you staff? couldn't they staff?	couldn't I be staffing? couldn't you be staffing? couldn't he be staffing? couldn't we be staffing? couldn't you be staffing? couldn't they be staffing?
Perfect	V-ing perfect
couldn't I have staffed? couldn't you have staffed? couldn't he have staffed? couldn't we have staffed? couldn't you have staffed? couldn't they have staffed?	couldn't I have been staffing? couldn't you have been staffing? couldn't he have been staffing? couldn't we have been staffing? couldn't you have been staffing? couldn't they have been staffing?