I could butter you could butter he could butter we could butter you could butter they could butter
Forma com V-ing
I could be buttering you could be buttering he could be buttering we could be buttering you could be buttering they could be buttering
Perfeito
I could have buttered you could have buttered he could have buttered we could have buttered you could have buttered they could have buttered
Perfeito com V-ing
I could have been buttering you could have been buttering he could have been buttering we could have been buttering you could have been buttering they could have been buttering
Negação
Forma simple
I could not butter you could not butter he could not butter we could not butter you could not butter they could not butter
Forma com V-ing
I could not be buttering you could not be buttering he could not be buttering we could not be buttering you could not be buttering they could not be buttering
Perfeito
I could not have buttered you could not have buttered he could not have buttered we could not have buttered you could not have buttered they could not have buttered
Perfeito com V-ing
I could not have been buttering you could not have been buttering he could not have been buttering we could not have been buttering you could not have been buttering they could not have been buttering
Forma interrogativa
Forma simple
could I butter? could you butter? could he butter? could we butter? could you butter? could they butter?
Forma com V-ing
could I be buttering? could you be buttering? could he be buttering? could we be buttering? could you be buttering? could they be buttering?
Perfeito
could I have buttered? could you have buttered? could he have buttered? could we have buttered? could you have buttered? could they have buttered?
Perfeito com V-ing
could I have been buttering? could you have been buttering? could he have been buttering? could we have been buttering? could you have been buttering? could they have been buttering?
Forma interro-Negação
Forma simple
could I not butter? could you not butter? could he not butter? could we not butter? could you not butter? could they not butter?
Forma com V-ing
could I not be buttering? could you not be buttering? could he not be buttering? could we not be buttering? could you not be buttering? could they not be buttering?
Perfeito
could I not have buttered? could you not have buttered? could he not have buttered? could we not have buttered? could you not have buttered? could they not have buttered?
Perfeito com V-ing
could I not have been buttering? could you not have been buttering? could he not have been buttering? could we not have been buttering? could you not have been buttering? could they not have been buttering?