English verb conjugation
COULD BUFF

Regular verb: buff - buffed - buffed

Affirmation

Simple form	V-ing form
I could buff you could buff she could buff we could buff you could buff they could buff	I could be buffing you could be buffing she could be buffing we could be buffing you could be buffing they could be buffing
Perfect	V-ing perfect
I could have buffed you could have buffed she could have buffed we could have buffed you could have buffed they could have buffed	I could have been buffing you could have been buffing she could have been buffing we could have been buffing you could have been buffing they could have been buffing

Negation

Simple form	V-ing form
I couldn't buff you couldn't buff she couldn't buff we couldn't buff you couldn't buff they couldn't buff	I couldn't be buffing you couldn't be buffing she couldn't be buffing we couldn't be buffing you couldn't be buffing they couldn't be buffing
Perfect	V-ing perfect
I couldn't have buffed you couldn't have buffed she couldn't have buffed we couldn't have buffed you couldn't have buffed they couldn't have buffed	I couldn't have been buffing you couldn't have been buffing she couldn't have been buffing we couldn't have been buffing you couldn't have been buffing they couldn't have been buffing

Interrogative form

Simple form	V-ing form
could I buff? could you buff? could she buff? could we buff? could you buff? could they buff?	could I be buffing? could you be buffing? could she be buffing? could we be buffing? could you be buffing? could they be buffing?
Perfect	V-ing perfect
could I have buffed? could you have buffed? could she have buffed? could we have buffed? could you have buffed? could they have buffed?	could I have been buffing? could you have been buffing? could she have been buffing? could we have been buffing? could you have been buffing? could they have been buffing?

Interro-negative form

Simple form	V-ing form
couldn't I buff? couldn't you buff? couldn't she buff? couldn't we buff? couldn't you buff? couldn't they buff?	couldn't I be buffing? couldn't you be buffing? couldn't she be buffing? couldn't we be buffing? couldn't you be buffing? couldn't they be buffing?
Perfect	V-ing perfect
couldn't I have buffed? couldn't you have buffed? couldn't she have buffed? couldn't we have buffed? couldn't you have buffed? couldn't they have buffed?	couldn't I have been buffing? couldn't you have been buffing? couldn't she have been buffing? couldn't we have been buffing? couldn't you have been buffing? couldn't they have been buffing?