I could untie you could untie he could untie we could untie you could untie they could untie
Forma com V-ing
I could be untying you could be untying he could be untying we could be untying you could be untying they could be untying
Perfeito
I could have untied you could have untied he could have untied we could have untied you could have untied they could have untied
Perfeito com V-ing
I could have been untying you could have been untying he could have been untying we could have been untying you could have been untying they could have been untying
Negação
Forma simple
I could not untie you could not untie he could not untie we could not untie you could not untie they could not untie
Forma com V-ing
I could not be untying you could not be untying he could not be untying we could not be untying you could not be untying they could not be untying
Perfeito
I could not have untied you could not have untied he could not have untied we could not have untied you could not have untied they could not have untied
Perfeito com V-ing
I could not have been untying you could not have been untying he could not have been untying we could not have been untying you could not have been untying they could not have been untying
Forma interrogativa
Forma simple
could I untie? could you untie? could he untie? could we untie? could you untie? could they untie?
Forma com V-ing
could I be untying? could you be untying? could he be untying? could we be untying? could you be untying? could they be untying?
Perfeito
could I have untied? could you have untied? could he have untied? could we have untied? could you have untied? could they have untied?
Perfeito com V-ing
could I have been untying? could you have been untying? could he have been untying? could we have been untying? could you have been untying? could they have been untying?
Forma interro-Negação
Forma simple
could I not untie? could you not untie? could he not untie? could we not untie? could you not untie? could they not untie?
Forma com V-ing
could I not be untying? could you not be untying? could he not be untying? could we not be untying? could you not be untying? could they not be untying?
Perfeito
could I not have untied? could you not have untied? could he not have untied? could we not have untied? could you not have untied? could they not have untied?
Perfeito com V-ing
could I not have been untying? could you not have been untying? could he not have been untying? could we not have been untying? could you not have been untying? could they not have been untying?