must sift
Verbe régulier : sift - sifted- sifted
Traduction française : tamiser - fouiller 

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must sift
you must sift
she must sift
we must sift
you must sift
they must sift 	I must be sifting
you must be sifting
she must be sifting
we must be sifting
you must be sifting
they must be sifting	I must have sifted
you must have sifted
she must have sifted
we must have sifted
you must have sifted
they must have sifted	I must have been sifting
you must have been sifting
she must have been sifting
we must have been sifting
you must have been sifting
they must have been sifting	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I mustn't sift
you mustn't sift
she mustn't sift
we mustn't sift
you mustn't sift
they mustn't sift 	I mustn't be sifting
you mustn't be sifting
she mustn't be sifting
we mustn't be sifting
you mustn't be sifting
they mustn't be sifting	I mustn't have sifted
you mustn't have sifted
she mustn't have sifted
we mustn't have sifted
you mustn't have sifted
they mustn't have sifted	I mustn't have been sifting
you mustn't have been sifting
she mustn't have been sifting
we mustn't have been sifting
you mustn't have been sifting
they mustn't have been sifting	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I sift?
must you sift?
must she sift?
must we sift?
must you sift?
must they sift? 	must I be sifting?
must you be sifting?
must she be sifting?
must we be sifting?
must you be sifting?
must they be sifting? 	must I have sifted?
must you have sifted?
must she have sifted?
must we have sifted?
must you have sifted?
must they have sifted? 	must I have been sifting?
must you have been sifting?
must she have been sifting?
must we have been sifting?
must you have been sifting?
must they have been sifting? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
mustn't I sift?
mustn't you sift?
mustn't she sift?
mustn't we sift?
mustn't you sift?
mustn't they sift? 	mustn't I be sifting?
mustn't you be sifting?
mustn't she be sifting?
mustn't we be sifting?
mustn't you be sifting?
mustn't they be sifting? 	mustn't I have sifted?
mustn't you have sifted?
mustn't she have sifted?
mustn't we have sifted?
mustn't you have sifted?
mustn't they have sifted? 	mustn't I have been sifting?
mustn't you have been sifting?
mustn't she have been sifting?
mustn't we have been sifting?
mustn't you have been sifting?
mustn't they have been sifting?