could quaff
Regular verb: quaff - quaffed- quaffed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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? 	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 	Perfect 	V-ing perfect 	
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? 	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?