must decide
Verbe régulier : decide - decided- decided
Traduction française : décider 

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must decide
you must decide
she must decide
we must decide
you must decide
they must decide 	I must be deciding
you must be deciding
she must be deciding
we must be deciding
you must be deciding
they must be deciding	I must have decided
you must have decided
she must have decided
we must have decided
you must have decided
they must have decided	I must have been deciding
you must have been deciding
she must have been deciding
we must have been deciding
you must have been deciding
they must have been deciding	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I mustn't decide
you mustn't decide
she mustn't decide
we mustn't decide
you mustn't decide
they mustn't decide 	I mustn't be deciding
you mustn't be deciding
she mustn't be deciding
we mustn't be deciding
you mustn't be deciding
they mustn't be deciding	I mustn't have decided
you mustn't have decided
she mustn't have decided
we mustn't have decided
you mustn't have decided
they mustn't have decided	I mustn't have been deciding
you mustn't have been deciding
she mustn't have been deciding
we mustn't have been deciding
you mustn't have been deciding
they mustn't have been deciding	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I decide?
must you decide?
must she decide?
must we decide?
must you decide?
must they decide? 	must I be deciding?
must you be deciding?
must she be deciding?
must we be deciding?
must you be deciding?
must they be deciding? 	must I have decided?
must you have decided?
must she have decided?
must we have decided?
must you have decided?
must they have decided? 	must I have been deciding?
must you have been deciding?
must she have been deciding?
must we have been deciding?
must you have been deciding?
must they have been deciding? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
mustn't I decide?
mustn't you decide?
mustn't she decide?
mustn't we decide?
mustn't you decide?
mustn't they decide? 	mustn't I be deciding?
mustn't you be deciding?
mustn't she be deciding?
mustn't we be deciding?
mustn't you be deciding?
mustn't they be deciding? 	mustn't I have decided?
mustn't you have decided?
mustn't she have decided?
mustn't we have decided?
mustn't you have decided?
mustn't they have decided? 	mustn't I have been deciding?
mustn't you have been deciding?
mustn't she have been deciding?
mustn't we have been deciding?
mustn't you have been deciding?
mustn't they have been deciding?