must fret
Verbe régulier : fret - fretted- fretted
Traduction française : tracasser - ronger 

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must fret
you must fret
he must fret
we must fret
you must fret
they must fret 	I must be fretting
you must be fretting
he must be fretting
we must be fretting
you must be fretting
they must be fretting	I must have fretted
you must have fretted
he must have fretted
we must have fretted
you must have fretted
they must have fretted	I must have been fretting
you must have been fretting
he must have been fretting
we must have been fretting
you must have been fretting
they must have been fretting	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I mustn't fret
you mustn't fret
he mustn't fret
we mustn't fret
you mustn't fret
they mustn't fret 	I mustn't be fretting
you mustn't be fretting
he mustn't be fretting
we mustn't be fretting
you mustn't be fretting
they mustn't be fretting	I mustn't have fretted
you mustn't have fretted
he mustn't have fretted
we mustn't have fretted
you mustn't have fretted
they mustn't have fretted	I mustn't have been fretting
you mustn't have been fretting
he mustn't have been fretting
we mustn't have been fretting
you mustn't have been fretting
they mustn't have been fretting	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I fret?
must you fret?
must he fret?
must we fret?
must you fret?
must they fret? 	must I be fretting?
must you be fretting?
must he be fretting?
must we be fretting?
must you be fretting?
must they be fretting? 	must I have fretted?
must you have fretted?
must he have fretted?
must we have fretted?
must you have fretted?
must they have fretted? 	must I have been fretting?
must you have been fretting?
must he have been fretting?
must we have been fretting?
must you have been fretting?
must they have been fretting? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
mustn't I fret?
mustn't you fret?
mustn't he fret?
mustn't we fret?
mustn't you fret?
mustn't they fret? 	mustn't I be fretting?
mustn't you be fretting?
mustn't he be fretting?
mustn't we be fretting?
mustn't you be fretting?
mustn't they be fretting? 	mustn't I have fretted?
mustn't you have fretted?
mustn't he have fretted?
mustn't we have fretted?
mustn't you have fretted?
mustn't they have fretted? 	mustn't I have been fretting?
mustn't you have been fretting?
mustn't he have been fretting?
mustn't we have been fretting?
mustn't you have been fretting?
mustn't they have been fretting?