English verb conjugation
COULD STAFF

Regular verb: staff - staffed - staffed

Affirmation

Simple form	V-ing form
I could staff you could staff she could staff we could staff you could staff they could staff	I could be staffing you could be staffing she 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 she 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 she 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 she 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 she 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 she 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 she 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 she staff? could we staff? could you staff? could they staff?	could I be staffing? could you be staffing? could she 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 she 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 she 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 she 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 she 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 she 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 she have been staffing? couldn't we have been staffing? couldn't you have been staffing? couldn't they have been staffing?