must sing
Verbe irrégulier : sing - sang- sung
Traduction française : chanter 

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must sing
you must sing
he must sing
we must sing
you must sing
they must sing 	I must be singing
you must be singing
he must be singing
we must be singing
you must be singing
they must be singing	I must have sung
you must have sung
he must have sung
we must have sung
you must have sung
they must have sung	I must have been singing
you must have been singing
he must have been singing
we must have been singing
you must have been singing
they must have been singing	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I mustn't sing
you mustn't sing
he mustn't sing
we mustn't sing
you mustn't sing
they mustn't sing 	I mustn't be singing
you mustn't be singing
he mustn't be singing
we mustn't be singing
you mustn't be singing
they mustn't be singing	I mustn't have sung
you mustn't have sung
he mustn't have sung
we mustn't have sung
you mustn't have sung
they mustn't have sung	I mustn't have been singing
you mustn't have been singing
he mustn't have been singing
we mustn't have been singing
you mustn't have been singing
they mustn't have been singing	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I sing?
must you sing?
must he sing?
must we sing?
must you sing?
must they sing? 	must I be singing?
must you be singing?
must he be singing?
must we be singing?
must you be singing?
must they be singing? 	must I have sung?
must you have sung?
must he have sung?
must we have sung?
must you have sung?
must they have sung? 	must I have been singing?
must you have been singing?
must he have been singing?
must we have been singing?
must you have been singing?
must they have been singing? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
mustn't I sing?
mustn't you sing?
mustn't he sing?
mustn't we sing?
mustn't you sing?
mustn't they sing? 	mustn't I be singing?
mustn't you be singing?
mustn't he be singing?
mustn't we be singing?
mustn't you be singing?
mustn't they be singing? 	mustn't I have sung?
mustn't you have sung?
mustn't he have sung?
mustn't we have sung?
mustn't you have sung?
mustn't they have sung? 	mustn't I have been singing?
mustn't you have been singing?
mustn't he have been singing?
mustn't we have been singing?
mustn't you have been singing?
mustn't they have been singing?