English verb conjugation
CAN STUFF

Regular verb: stuff - stuffed - stuffed

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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