English verb conjugation
COULD STUFF

Regular verb: stuff - stuffed - stuffed

Affirmation

Simple form	V-ing form
I could stuff you could stuff he could stuff we could stuff you could stuff they could stuff	I could be stuffing you could be stuffing he could be stuffing we could be stuffing you could be stuffing they could be stuffing
Perfect	V-ing perfect
I could have stuffed you could have stuffed he could have stuffed we could have stuffed you could have stuffed they could have stuffed	I could have been stuffing you could have been stuffing he could have been stuffing we could have been stuffing you could have been stuffing they could have been stuffing

Negation

Simple form	V-ing form
I couldn't stuff you couldn't stuff he couldn't stuff we couldn't stuff you couldn't stuff they couldn't stuff	I couldn't be stuffing you couldn't be stuffing he couldn't be stuffing we couldn't be stuffing you couldn't be stuffing they couldn't be stuffing
Perfect	V-ing perfect
I couldn't have stuffed you couldn't have stuffed he couldn't have stuffed we couldn't have stuffed you couldn't have stuffed they couldn't have stuffed	I couldn't have been stuffing you couldn't have been stuffing he couldn't have been stuffing we couldn't have been stuffing you couldn't have been stuffing they couldn't have been stuffing

Interrogative form

Simple form	V-ing form
could I stuff? could you stuff? could he stuff? could we stuff? could you stuff? could they stuff?	could I be stuffing? could you be stuffing? could he be stuffing? could we be stuffing? could you be stuffing? could they be stuffing?
Perfect	V-ing perfect
could I have stuffed? could you have stuffed? could he have stuffed? could we have stuffed? could you have stuffed? could they have stuffed?	could I have been stuffing? could you have been stuffing? could he have been stuffing? could we have been stuffing? could you have been stuffing? could they have been stuffing?

Interro-negative form

Simple form	V-ing form
couldn't I stuff? couldn't you stuff? couldn't he stuff? couldn't we stuff? couldn't you stuff? couldn't they stuff?	couldn't I be stuffing? couldn't you be stuffing? couldn't he be stuffing? couldn't we be stuffing? couldn't you be stuffing? couldn't they be stuffing?
Perfect	V-ing perfect
couldn't I have stuffed? couldn't you have stuffed? couldn't he have stuffed? couldn't we have stuffed? couldn't you have stuffed? couldn't they have stuffed?	couldn't I have been stuffing? couldn't you have been stuffing? couldn't he have been stuffing? couldn't we have been stuffing? couldn't you have been stuffing? couldn't they have been stuffing?