could unvoice
Verbo regular: unvoice - unvoiced- unvoiced

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could unvoice
you could unvoice
he could unvoice
we could unvoice
you could unvoice
they could unvoice 	I could be unvoicing
you could be unvoicing
he could be unvoicing
we could be unvoicing
you could be unvoicing
they could be unvoicing	I could have unvoiced
you could have unvoiced
he could have unvoiced
we could have unvoiced
you could have unvoiced
they could have unvoiced	I could have been unvoicing
you could have been unvoicing
he could have been unvoicing
we could have been unvoicing
you could have been unvoicing
they could have been unvoicing	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could not unvoice
you could not unvoice
he could not unvoice
we could not unvoice
you could not unvoice
they could not unvoice 	I could not be unvoicing
you could not be unvoicing
he could not be unvoicing
we could not be unvoicing
you could not be unvoicing
they could not be unvoicing	I could not have unvoiced
you could not have unvoiced
he could not have unvoiced
we could not have unvoiced
you could not have unvoiced
they could not have unvoiced	I could not have been unvoicing
you could not have been unvoicing
he could not have been unvoicing
we could not have been unvoicing
you could not have been unvoicing
they could not have been unvoicing	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I unvoice?
could you unvoice?
could he unvoice?
could we unvoice?
could you unvoice?
could they unvoice? 	could I be unvoicing?
could you be unvoicing?
could he be unvoicing?
could we be unvoicing?
could you be unvoicing?
could they be unvoicing? 	could I have unvoiced?
could you have unvoiced?
could he have unvoiced?
could we have unvoiced?
could you have unvoiced?
could they have unvoiced? 	could I have been unvoicing?
could you have been unvoicing?
could he have been unvoicing?
could we have been unvoicing?
could you have been unvoicing?
could they have been unvoicing? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I not unvoice?
could you not unvoice?
could he not unvoice?
could we not unvoice?
could you not unvoice?
could they not unvoice? 	could I not be unvoicing?
could you not be unvoicing?
could he not be unvoicing?
could we not be unvoicing?
could you not be unvoicing?
could they not be unvoicing? 	could I not have unvoiced?
could you not have unvoiced?
could he not have unvoiced?
could we not have unvoiced?
could you not have unvoiced?
could they not have unvoiced? 	could I not have been unvoicing?
could you not have been unvoicing?
could he not have been unvoicing?
could we not have been unvoicing?
could you not have been unvoicing?
could they not have been unvoicing?