must mousse
Regular verb: mousse - moussed- moussed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must mousse
you must mousse
he must mousse
we must mousse
you must mousse
they must mousse 	I must be moussing
you must be moussing
he must be moussing
we must be moussing
you must be moussing
they must be moussing	I must have moussed
you must have moussed
he must have moussed
we must have moussed
you must have moussed
they must have moussed	I must have been moussing
you must have been moussing
he must have been moussing
we must have been moussing
you must have been moussing
they must have been moussing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't mousse
you mustn't mousse
he mustn't mousse
we mustn't mousse
you mustn't mousse
they mustn't mousse 	I mustn't be moussing
you mustn't be moussing
he mustn't be moussing
we mustn't be moussing
you mustn't be moussing
they mustn't be moussing	I mustn't have moussed
you mustn't have moussed
he mustn't have moussed
we mustn't have moussed
you mustn't have moussed
they mustn't have moussed	I mustn't have been moussing
you mustn't have been moussing
he mustn't have been moussing
we mustn't have been moussing
you mustn't have been moussing
they mustn't have been moussing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I mousse?
must you mousse?
must he mousse?
must we mousse?
must you mousse?
must they mousse? 	must I be moussing?
must you be moussing?
must he be moussing?
must we be moussing?
must you be moussing?
must they be moussing? 	must I have moussed?
must you have moussed?
must he have moussed?
must we have moussed?
must you have moussed?
must they have moussed? 	must I have been moussing?
must you have been moussing?
must he have been moussing?
must we have been moussing?
must you have been moussing?
must they have been moussing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I mousse?
mustn't you mousse?
mustn't he mousse?
mustn't we mousse?
mustn't you mousse?
mustn't they mousse? 	mustn't I be moussing?
mustn't you be moussing?
mustn't he be moussing?
mustn't we be moussing?
mustn't you be moussing?
mustn't they be moussing? 	mustn't I have moussed?
mustn't you have moussed?
mustn't he have moussed?
mustn't we have moussed?
mustn't you have moussed?
mustn't they have moussed? 	mustn't I have been moussing?
mustn't you have been moussing?
mustn't he have been moussing?
mustn't we have been moussing?
mustn't you have been moussing?
mustn't they have been moussing?