could quaff
Regular verb: quaff - quaffed- quaffed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could quaff
you could quaff
she could quaff
we could quaff
you could quaff
they could quaff 	I could be quaffing
you could be quaffing
she could be quaffing
we could be quaffing
you could be quaffing
they could be quaffing	I could have quaffed
you could have quaffed
she 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
she 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 	Perfect 	V-ing perfect 	
I couldn't quaff
you couldn't quaff
she 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
she couldn't be quaffing
we couldn't be quaffing
you couldn't be quaffing
they couldn't be quaffing	I couldn't have quaffed
you couldn't have quaffed
she 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
she 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 	Perfect 	V-ing perfect 	
could I quaff?
could you quaff?
could she quaff?
could we quaff?
could you quaff?
could they quaff? 	could I be quaffing?
could you be quaffing?
could she be quaffing?
could we be quaffing?
could you be quaffing?
could they be quaffing? 	could I have quaffed?
could you have quaffed?
could she 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 she 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 	Perfect 	V-ing perfect 	
couldn't I quaff?
couldn't you quaff?
couldn't she 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 she be quaffing?
couldn't we be quaffing?
couldn't you be quaffing?
couldn't they be quaffing? 	couldn't I have quaffed?
couldn't you have quaffed?
couldn't she 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 she have been quaffing?
couldn't we have been quaffing?
couldn't you have been quaffing?
couldn't they have been quaffing?