could unshift
Verbo regular: unshift - unshifted- unshifted

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

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I couldn't unshift
you couldn't unshift
he couldn't unshift
we couldn't unshift
you couldn't unshift
they couldn't unshift 	I couldn't be unshifting
you couldn't be unshifting
he couldn't be unshifting
we couldn't be unshifting
you couldn't be unshifting
they couldn't be unshifting	I couldn't have unshifted
you couldn't have unshifted
he couldn't have unshifted
we couldn't have unshifted
you couldn't have unshifted
they couldn't have unshifted	I couldn't have been unshifting
you couldn't have been unshifting
he couldn't have been unshifting
we couldn't have been unshifting
you couldn't have been unshifting
they couldn't have been unshifting	

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

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
couldn't I unshift?
couldn't you unshift?
couldn't he unshift?
couldn't we unshift?
couldn't you unshift?
couldn't they unshift? 	couldn't I be unshifting?
couldn't you be unshifting?
couldn't he be unshifting?
couldn't we be unshifting?
couldn't you be unshifting?
couldn't they be unshifting? 	couldn't I have unshifted?
couldn't you have unshifted?
couldn't he have unshifted?
couldn't we have unshifted?
couldn't you have unshifted?
couldn't they have unshifted? 	couldn't I have been unshifting?
couldn't you have been unshifting?
couldn't he have been unshifting?
couldn't we have been unshifting?
couldn't you have been unshifting?
couldn't they have been unshifting?