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 could not buff you could not buff she could not buff we could not buff you could not buff they could not buff	I could not be buffing you could not be buffing she could not be buffing we could not be buffing you could not be buffing they could not be buffing
Perfect	V-ing perfect
I could not have buffed you could not have buffed she could not have buffed we could not have buffed you could not have buffed they could not have buffed	I could not have been buffing you could not have been buffing she could not have been buffing we could not have been buffing you could not have been buffing they could not 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
could I not buff? could you not buff? could she not buff? could we not buff? could you not buff? could they not buff?	could I not be buffing? could you not be buffing? could she not be buffing? could we not be buffing? could you not be buffing? could they not be buffing?
Perfect	V-ing perfect
could I not have buffed? could you not have buffed? could she not have buffed? could we not have buffed? could you not have buffed? could they not have buffed?	could I not have been buffing? could you not have been buffing? could she not have been buffing? could we not have been buffing? could you not have been buffing? could they not have been buffing?