must unshift
Verbo regular: unshift - unshifted- unshifted

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must unshift
you must unshift
she must unshift
we must unshift
you must unshift
they must unshift 	I must be unshifting
you must be unshifting
she must be unshifting
we must be unshifting
you must be unshifting
they must be unshifting	I must have unshifted
you must have unshifted
she 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
she must have been unshifting
we must have been unshifting
you must have been unshifting
they must have been unshifting	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must not unshift
you must not unshift
she must not unshift
we must not unshift
you must not unshift
they must not unshift 	I must not be unshifting
you must not be unshifting
she must not be unshifting
we must not be unshifting
you must not be unshifting
they must not be unshifting	I must not have unshifted
you must not have unshifted
she must not have unshifted
we must not have unshifted
you must not have unshifted
they must not have unshifted	I must not have been unshifting
you must not have been unshifting
she must not have been unshifting
we must not have been unshifting
you must not have been unshifting
they must not have been unshifting	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I unshift?
must you unshift?
must she unshift?
must we unshift?
must you unshift?
must they unshift? 	must I be unshifting?
must you be unshifting?
must she be unshifting?
must we be unshifting?
must you be unshifting?
must they be unshifting? 	must I have unshifted?
must you have unshifted?
must she 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 she have been unshifting?
must we have been unshifting?
must you have been unshifting?
must they have been unshifting? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I not unshift?
must you not unshift?
must she not unshift?
must we not unshift?
must you not unshift?
must they not unshift? 	must I not be unshifting?
must you not be unshifting?
must she not be unshifting?
must we not be unshifting?
must you not be unshifting?
must they not be unshifting? 	must I not have unshifted?
must you not have unshifted?
must she not have unshifted?
must we not have unshifted?
must you not have unshifted?
must they not have unshifted? 	must I not have been unshifting?
must you not have been unshifting?
must she not have been unshifting?
must we not have been unshifting?
must you not have been unshifting?
must they not have been unshifting?