English verb conjugation
COULD OVERSTUFF

Regular verb: overstuff - overstuffed - overstuffed

Affirmation

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