must fuss
Regular verb: fuss - fussed- fussed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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? 	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 	Perfect 	V-ing perfect 	
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? 	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?