must upshift
Verbe régulier : upshift - upshifted- upshifted

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must upshift
you must upshift
she must upshift
we must upshift
you must upshift
they must upshift 	I must be upshifting
you must be upshifting
she must be upshifting
we must be upshifting
you must be upshifting
they must be upshifting	I must have upshifted
you must have upshifted
she must have upshifted
we must have upshifted
you must have upshifted
they must have upshifted	I must have been upshifting
you must have been upshifting
she must have been upshifting
we must have been upshifting
you must have been upshifting
they must have been upshifting	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I mustn't upshift
you mustn't upshift
she mustn't upshift
we mustn't upshift
you mustn't upshift
they mustn't upshift 	I mustn't be upshifting
you mustn't be upshifting
she mustn't be upshifting
we mustn't be upshifting
you mustn't be upshifting
they mustn't be upshifting	I mustn't have upshifted
you mustn't have upshifted
she mustn't have upshifted
we mustn't have upshifted
you mustn't have upshifted
they mustn't have upshifted	I mustn't have been upshifting
you mustn't have been upshifting
she mustn't have been upshifting
we mustn't have been upshifting
you mustn't have been upshifting
they mustn't have been upshifting	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I upshift?
must you upshift?
must she upshift?
must we upshift?
must you upshift?
must they upshift? 	must I be upshifting?
must you be upshifting?
must she be upshifting?
must we be upshifting?
must you be upshifting?
must they be upshifting? 	must I have upshifted?
must you have upshifted?
must she have upshifted?
must we have upshifted?
must you have upshifted?
must they have upshifted? 	must I have been upshifting?
must you have been upshifting?
must she have been upshifting?
must we have been upshifting?
must you have been upshifting?
must they have been upshifting? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
mustn't I upshift?
mustn't you upshift?
mustn't she upshift?
mustn't we upshift?
mustn't you upshift?
mustn't they upshift? 	mustn't I be upshifting?
mustn't you be upshifting?
mustn't she be upshifting?
mustn't we be upshifting?
mustn't you be upshifting?
mustn't they be upshifting? 	mustn't I have upshifted?
mustn't you have upshifted?
mustn't she have upshifted?
mustn't we have upshifted?
mustn't you have upshifted?
mustn't they have upshifted? 	mustn't I have been upshifting?
mustn't you have been upshifting?
mustn't she have been upshifting?
mustn't we have been upshifting?
mustn't you have been upshifting?
mustn't they have been upshifting?