English verb conjugation
MUST FUSS

Regular verb: fuss - fussed - fussed

Affirmation

Simple form	V-ing form
I must fuss you must fuss he must fuss we must fuss you must fuss they must fuss	I must be fussing you must be fussing he must be fussing we must be fussing you must be fussing they must be fussing
Perfect	V-ing perfect
I must have fussed you must have fussed he must have fussed we must have fussed you must have fussed they must have fussed	I must have been fussing you must have been fussing he must have been fussing we must have been fussing you must have been fussing they must have been fussing

Negation

Simple form	V-ing form
I mustn't fuss you mustn't fuss he mustn't fuss we mustn't fuss you mustn't fuss they mustn't fuss	I mustn't be fussing you mustn't be fussing he mustn't be fussing we mustn't be fussing you mustn't be fussing they mustn't be fussing
Perfect	V-ing perfect
I mustn't have fussed you mustn't have fussed he mustn't have fussed we mustn't have fussed you mustn't have fussed they mustn't have fussed	I mustn't have been fussing you mustn't have been fussing he mustn't have been fussing we mustn't have been fussing you mustn't have been fussing they mustn't have been fussing

Interrogative form

Simple form	V-ing form
must I fuss? must you fuss? must he fuss? must we fuss? must you fuss? must they fuss?	must I be fussing? must you be fussing? must he be fussing? must we be fussing? must you be fussing? must they be fussing?
Perfect	V-ing perfect
must I have fussed? must you have fussed? must he have fussed? must we have fussed? must you have fussed? must they have fussed?	must I have been fussing? must you have been fussing? must he have been fussing? must we have been fussing? must you have been fussing? must they have been fussing?

Interro-negative form

Simple form	V-ing form
mustn't I fuss? mustn't you fuss? mustn't he fuss? mustn't we fuss? mustn't you fuss? mustn't they fuss?	mustn't I be fussing? mustn't you be fussing? mustn't he be fussing? mustn't we be fussing? mustn't you be fussing? mustn't they be fussing?
Perfect	V-ing perfect
mustn't I have fussed? mustn't you have fussed? mustn't he have fussed? mustn't we have fussed? mustn't you have fussed? mustn't they have fussed?	mustn't I have been fussing? mustn't you have been fussing? mustn't he have been fussing? mustn't we have been fussing? mustn't you have been fussing? mustn't they have been fussing?