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 couldn't quaff you couldn't quaff he couldn't quaff we couldn't quaff you couldn't quaff they couldn't quaff	I couldn't be quaffing you couldn't be quaffing he couldn't be quaffing we couldn't be quaffing you couldn't be quaffing they couldn't be quaffing
Perfect	V-ing perfect
I couldn't have quaffed you couldn't have quaffed he couldn't have quaffed we couldn't have quaffed you couldn't have quaffed they couldn't have quaffed	I couldn't have been quaffing you couldn't have been quaffing he couldn't have been quaffing we couldn't have been quaffing you couldn't have been quaffing they couldn't 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
couldn't I quaff? couldn't you quaff? couldn't he quaff? couldn't we quaff? couldn't you quaff? couldn't they quaff?	couldn't I be quaffing? couldn't you be quaffing? couldn't he be quaffing? couldn't we be quaffing? couldn't you be quaffing? couldn't they be quaffing?
Perfect	V-ing perfect
couldn't I have quaffed? couldn't you have quaffed? couldn't he have quaffed? couldn't we have quaffed? couldn't you have quaffed? couldn't they have quaffed?	couldn't I have been quaffing? couldn't you have been quaffing? couldn't he have been quaffing? couldn't we have been quaffing? couldn't you have been quaffing? couldn't they have been quaffing?