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 could not stuff you could not stuff he could not stuff we could not stuff you could not stuff they could not stuff	I could not be stuffing you could not be stuffing he could not be stuffing we could not be stuffing you could not be stuffing they could not be stuffing
Perfect	V-ing perfect
I could not have stuffed you could not have stuffed he could not have stuffed we could not have stuffed you could not have stuffed they could not have stuffed	I could not have been stuffing you could not have been stuffing he could not have been stuffing we could not have been stuffing you could not have been stuffing they could not 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
could I not stuff? could you not stuff? could he not stuff? could we not stuff? could you not stuff? could they not stuff?	could I not be stuffing? could you not be stuffing? could he not be stuffing? could we not be stuffing? could you not be stuffing? could they not be stuffing?
Perfect	V-ing perfect
could I not have stuffed? could you not have stuffed? could he not have stuffed? could we not have stuffed? could you not have stuffed? could they not have stuffed?	could I not have been stuffing? could you not have been stuffing? could he not have been stuffing? could we not have been stuffing? could you not have been stuffing? could they not have been stuffing?