English verb conjugation
CAN STAFF

Regular verb: staff - staffed - staffed

Affirmation

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

Negation

Simple form	V-ing form
I can't staff you can't staff she can't staff we can't staff you can't staff they can't staff	I can't be staffing you can't be staffing she can't be staffing we can't be staffing you can't be staffing they can't be staffing
Perfect	V-ing perfect
I can't have staffed you can't have staffed she can't have staffed we can't have staffed you can't have staffed they can't have staffed	I can't have been staffing you can't have been staffing she can't have been staffing we can't have been staffing you can't have been staffing they can't have been staffing

Interrogative form

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

Interro-negative form

Simple form	V-ing form
can't I staff? can't you staff? can't she staff? can't we staff? can't you staff? can't they staff?	can't I be staffing? can't you be staffing? can't she be staffing? can't we be staffing? can't you be staffing? can't they be staffing?
Perfect	V-ing perfect
can't I have staffed? can't you have staffed? can't she have staffed? can't we have staffed? can't you have staffed? can't they have staffed?	can't I have been staffing? can't you have been staffing? can't she have been staffing? can't we have been staffing? can't you have been staffing? can't they have been staffing?