English verb conjugation
MUST STUFF

Regular verb: stuff - stuffed - stuffed

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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