English verb conjugation
COULD QUAFF

Regular verb: quaff - quaffed - quaffed

Affirmation

Simple form	V-ing form
I could quaff you could quaff he could quaff we could quaff you could quaff they could quaff	I could be quaffing you could be quaffing he could be quaffing we could be quaffing you could be quaffing they could be quaffing
Perfect	V-ing perfect
I could have quaffed you could have quaffed he could have quaffed we could have quaffed you could have quaffed they could have quaffed	I could have been quaffing you could have been quaffing he could have been quaffing we could have been quaffing you could have been quaffing they could have been quaffing

Negation

Simple form	V-ing form
I could not quaff you could not quaff he could not quaff we could not quaff you could not quaff they could not quaff	I could not be quaffing you could not be quaffing he could not be quaffing we could not be quaffing you could not be quaffing they could not be quaffing
Perfect	V-ing perfect
I could not have quaffed you could not have quaffed he could not have quaffed we could not have quaffed you could not have quaffed they could not have quaffed	I could not have been quaffing you could not have been quaffing he could not have been quaffing we could not have been quaffing you could not have been quaffing they could not have been quaffing

Interrogative form

Simple form	V-ing form
could I quaff? could you quaff? could he quaff? could we quaff? could you quaff? could they quaff?	could I be quaffing? could you be quaffing? could he be quaffing? could we be quaffing? could you be quaffing? could they be quaffing?
Perfect	V-ing perfect
could I have quaffed? could you have quaffed? could he have quaffed? could we have quaffed? could you have quaffed? could they have quaffed?	could I have been quaffing? could you have been quaffing? could he have been quaffing? could we have been quaffing? could you have been quaffing? could they have been quaffing?

Interro-negative form

Simple form	V-ing form
could I not quaff? could you not quaff? could he not quaff? could we not quaff? could you not quaff? could they not quaff?	could I not be quaffing? could you not be quaffing? could he not be quaffing? could we not be quaffing? could you not be quaffing? could they not be quaffing?
Perfect	V-ing perfect
could I not have quaffed? could you not have quaffed? could he not have quaffed? could we not have quaffed? could you not have quaffed? could they not have quaffed?	could I not have been quaffing? could you not have been quaffing? could he not have been quaffing? could we not have been quaffing? could you not have been quaffing? could they not have been quaffing?