must unshift
Verbo regular: unshift - unshifted- unshifted

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must unshift
you must unshift
he must unshift
we must unshift
you must unshift
they must unshift 	I must be unshifting
you must be unshifting
he must be unshifting
we must be unshifting
you must be unshifting
they must be unshifting	I must have unshifted
you must have unshifted
he must have unshifted
we must have unshifted
you must have unshifted
they must have unshifted	I must have been unshifting
you must have been unshifting
he must have been unshifting
we must have been unshifting
you must have been unshifting
they must have been unshifting	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I mustn't unshift
you mustn't unshift
he mustn't unshift
we mustn't unshift
you mustn't unshift
they mustn't unshift 	I mustn't be unshifting
you mustn't be unshifting
he mustn't be unshifting
we mustn't be unshifting
you mustn't be unshifting
they mustn't be unshifting	I mustn't have unshifted
you mustn't have unshifted
he mustn't have unshifted
we mustn't have unshifted
you mustn't have unshifted
they mustn't have unshifted	I mustn't have been unshifting
you mustn't have been unshifting
he mustn't have been unshifting
we mustn't have been unshifting
you mustn't have been unshifting
they mustn't have been unshifting	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I unshift?
must you unshift?
must he unshift?
must we unshift?
must you unshift?
must they unshift? 	must I be unshifting?
must you be unshifting?
must he be unshifting?
must we be unshifting?
must you be unshifting?
must they be unshifting? 	must I have unshifted?
must you have unshifted?
must he have unshifted?
must we have unshifted?
must you have unshifted?
must they have unshifted? 	must I have been unshifting?
must you have been unshifting?
must he have been unshifting?
must we have been unshifting?
must you have been unshifting?
must they have been unshifting? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
mustn't I unshift?
mustn't you unshift?
mustn't he unshift?
mustn't we unshift?
mustn't you unshift?
mustn't they unshift? 	mustn't I be unshifting?
mustn't you be unshifting?
mustn't he be unshifting?
mustn't we be unshifting?
mustn't you be unshifting?
mustn't they be unshifting? 	mustn't I have unshifted?
mustn't you have unshifted?
mustn't he have unshifted?
mustn't we have unshifted?
mustn't you have unshifted?
mustn't they have unshifted? 	mustn't I have been unshifting?
mustn't you have been unshifting?
mustn't he have been unshifting?
mustn't we have been unshifting?
mustn't you have been unshifting?
mustn't they have been unshifting?