could overstuff
Regular verb: overstuff - overstuffed- overstuffed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could overstuff
you could overstuff
she could overstuff
we could overstuff
you could overstuff
they could overstuff 	I could be overstuffing
you could be overstuffing
she could be overstuffing
we could be overstuffing
you could be overstuffing
they could be overstuffing	I could have overstuffed
you could have overstuffed
she could have overstuffed
we could have overstuffed
you could have overstuffed
they could have overstuffed	I could have been overstuffing
you could have been overstuffing
she could have been overstuffing
we could have been overstuffing
you could have been overstuffing
they could have been overstuffing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't overstuff
you couldn't overstuff
she couldn't overstuff
we couldn't overstuff
you couldn't overstuff
they couldn't overstuff 	I couldn't be overstuffing
you couldn't be overstuffing
she couldn't be overstuffing
we couldn't be overstuffing
you couldn't be overstuffing
they couldn't be overstuffing	I couldn't have overstuffed
you couldn't have overstuffed
she couldn't have overstuffed
we couldn't have overstuffed
you couldn't have overstuffed
they couldn't have overstuffed	I couldn't have been overstuffing
you couldn't have been overstuffing
she couldn't have been overstuffing
we couldn't have been overstuffing
you couldn't have been overstuffing
they couldn't have been overstuffing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I overstuff?
could you overstuff?
could she overstuff?
could we overstuff?
could you overstuff?
could they overstuff? 	could I be overstuffing?
could you be overstuffing?
could she be overstuffing?
could we be overstuffing?
could you be overstuffing?
could they be overstuffing? 	could I have overstuffed?
could you have overstuffed?
could she have overstuffed?
could we have overstuffed?
could you have overstuffed?
could they have overstuffed? 	could I have been overstuffing?
could you have been overstuffing?
could she have been overstuffing?
could we have been overstuffing?
could you have been overstuffing?
could they have been overstuffing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I overstuff?
couldn't you overstuff?
couldn't she overstuff?
couldn't we overstuff?
couldn't you overstuff?
couldn't they overstuff? 	couldn't I be overstuffing?
couldn't you be overstuffing?
couldn't she be overstuffing?
couldn't we be overstuffing?
couldn't you be overstuffing?
couldn't they be overstuffing? 	couldn't I have overstuffed?
couldn't you have overstuffed?
couldn't she have overstuffed?
couldn't we have overstuffed?
couldn't you have overstuffed?
couldn't they have overstuffed? 	couldn't I have been overstuffing?
couldn't you have been overstuffing?
couldn't she have been overstuffing?
couldn't we have been overstuffing?
couldn't you have been overstuffing?
couldn't they have been overstuffing?