I could shutter you could shutter he could shutter we could shutter you could shutter they could shutter
Forma com V-ing
I could be shuttering you could be shuttering he could be shuttering we could be shuttering you could be shuttering they could be shuttering
Perfeito
I could have shuttered you could have shuttered he could have shuttered we could have shuttered you could have shuttered they could have shuttered
Perfeito com V-ing
I could have been shuttering you could have been shuttering he could have been shuttering we could have been shuttering you could have been shuttering they could have been shuttering
Negação
Forma simple
I could not shutter you could not shutter he could not shutter we could not shutter you could not shutter they could not shutter
Forma com V-ing
I could not be shuttering you could not be shuttering he could not be shuttering we could not be shuttering you could not be shuttering they could not be shuttering
Perfeito
I could not have shuttered you could not have shuttered he could not have shuttered we could not have shuttered you could not have shuttered they could not have shuttered
Perfeito com V-ing
I could not have been shuttering you could not have been shuttering he could not have been shuttering we could not have been shuttering you could not have been shuttering they could not have been shuttering
Forma interrogativa
Forma simple
could I shutter? could you shutter? could he shutter? could we shutter? could you shutter? could they shutter?
Forma com V-ing
could I be shuttering? could you be shuttering? could he be shuttering? could we be shuttering? could you be shuttering? could they be shuttering?
Perfeito
could I have shuttered? could you have shuttered? could he have shuttered? could we have shuttered? could you have shuttered? could they have shuttered?
Perfeito com V-ing
could I have been shuttering? could you have been shuttering? could he have been shuttering? could we have been shuttering? could you have been shuttering? could they have been shuttering?
Forma interro-Negação
Forma simple
could I not shutter? could you not shutter? could he not shutter? could we not shutter? could you not shutter? could they not shutter?
Forma com V-ing
could I not be shuttering? could you not be shuttering? could he not be shuttering? could we not be shuttering? could you not be shuttering? could they not be shuttering?
Perfeito
could I not have shuttered? could you not have shuttered? could he not have shuttered? could we not have shuttered? could you not have shuttered? could they not have shuttered?
Perfeito com V-ing
could I not have been shuttering? could you not have been shuttering? could he not have been shuttering? could we not have been shuttering? could you not have been shuttering? could they not have been shuttering?