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 must not fuss you must not fuss he must not fuss we must not fuss you must not fuss they must not fuss	I must not be fussing you must not be fussing he must not be fussing we must not be fussing you must not be fussing they must not be fussing
Perfect	V-ing perfect
I must not have fussed you must not have fussed he must not have fussed we must not have fussed you must not have fussed they must not have fussed	I must not have been fussing you must not have been fussing he must not have been fussing we must not have been fussing you must not have been fussing they must not 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
must I not fuss? must you not fuss? must he not fuss? must we not fuss? must you not fuss? must they not fuss?	must I not be fussing? must you not be fussing? must he not be fussing? must we not be fussing? must you not be fussing? must they not be fussing?
Perfect	V-ing perfect
must I not have fussed? must you not have fussed? must he not have fussed? must we not have fussed? must you not have fussed? must they not have fussed?	must I not have been fussing? must you not have been fussing? must he not have been fussing? must we not have been fussing? must you not have been fussing? must they not have been fussing?