must upshift
Verbo regular: upshift - upshifted- upshifted

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must upshift
you must upshift
he must upshift
we must upshift
you must upshift
they must upshift 	I must be upshifting
you must be upshifting
he must be upshifting
we must be upshifting
you must be upshifting
they must be upshifting	I must have upshifted
you must have upshifted
he 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
he must have been upshifting
we must have been upshifting
you must have been upshifting
they must have been upshifting	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I mustn't upshift
you mustn't upshift
he 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
he 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
he 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
he mustn't have been upshifting
we mustn't have been upshifting
you mustn't have been upshifting
they mustn't have been upshifting	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I upshift?
must you upshift?
must he upshift?
must we upshift?
must you upshift?
must they upshift? 	must I be upshifting?
must you be upshifting?
must he be upshifting?
must we be upshifting?
must you be upshifting?
must they be upshifting? 	must I have upshifted?
must you have upshifted?
must he 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 he have been upshifting?
must we have been upshifting?
must you have been upshifting?
must they have been upshifting? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
mustn't I upshift?
mustn't you upshift?
mustn't he 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 he 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 he 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 he have been upshifting?
mustn't we have been upshifting?
mustn't you have been upshifting?
mustn't they have been upshifting?