English verb conjugation
CAN STAFF

Regular verb: staff - staffed - staffed

Affirmation

Simple form	V-ing form
I can staff you can staff he can staff we can staff you can staff they can staff	I can be staffing you can be staffing he 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 he 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 he 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 he 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 he 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 he 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 he 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 he staff? can we staff? can you staff? can they staff?	can I be staffing? can you be staffing? can he 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 he 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 he 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 he 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 he 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 he 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 he have been staffing? can't we have been staffing? can't you have been staffing? can't they have been staffing?