must fife
Verbe régulier : fife - fifed- fifed

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must fife
you must fife
she must fife
we must fife
you must fife
they must fife 	I must be fifing
you must be fifing
she must be fifing
we must be fifing
you must be fifing
they must be fifing	I must have fifed
you must have fifed
she must have fifed
we must have fifed
you must have fifed
they must have fifed	I must have been fifing
you must have been fifing
she must have been fifing
we must have been fifing
you must have been fifing
they must have been fifing	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I mustn't fife
you mustn't fife
she mustn't fife
we mustn't fife
you mustn't fife
they mustn't fife 	I mustn't be fifing
you mustn't be fifing
she mustn't be fifing
we mustn't be fifing
you mustn't be fifing
they mustn't be fifing	I mustn't have fifed
you mustn't have fifed
she mustn't have fifed
we mustn't have fifed
you mustn't have fifed
they mustn't have fifed	I mustn't have been fifing
you mustn't have been fifing
she mustn't have been fifing
we mustn't have been fifing
you mustn't have been fifing
they mustn't have been fifing	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I fife?
must you fife?
must she fife?
must we fife?
must you fife?
must they fife? 	must I be fifing?
must you be fifing?
must she be fifing?
must we be fifing?
must you be fifing?
must they be fifing? 	must I have fifed?
must you have fifed?
must she have fifed?
must we have fifed?
must you have fifed?
must they have fifed? 	must I have been fifing?
must you have been fifing?
must she have been fifing?
must we have been fifing?
must you have been fifing?
must they have been fifing? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
mustn't I fife?
mustn't you fife?
mustn't she fife?
mustn't we fife?
mustn't you fife?
mustn't they fife? 	mustn't I be fifing?
mustn't you be fifing?
mustn't she be fifing?
mustn't we be fifing?
mustn't you be fifing?
mustn't they be fifing? 	mustn't I have fifed?
mustn't you have fifed?
mustn't she have fifed?
mustn't we have fifed?
mustn't you have fifed?
mustn't they have fifed? 	mustn't I have been fifing?
mustn't you have been fifing?
mustn't she have been fifing?
mustn't we have been fifing?
mustn't you have been fifing?
mustn't they have been fifing?