I could trephine you could trephine he could trephine we could trephine you could trephine they could trephine
Forma com V-ing
I could be trephining you could be trephining he could be trephining we could be trephining you could be trephining they could be trephining
Perfeito
I could have trephined you could have trephined he could have trephined we could have trephined you could have trephined they could have trephined
Perfeito com V-ing
I could have been trephining you could have been trephining he could have been trephining we could have been trephining you could have been trephining they could have been trephining
Negação
Forma simple
I could not trephine you could not trephine he could not trephine we could not trephine you could not trephine they could not trephine
Forma com V-ing
I could not be trephining you could not be trephining he could not be trephining we could not be trephining you could not be trephining they could not be trephining
Perfeito
I could not have trephined you could not have trephined he could not have trephined we could not have trephined you could not have trephined they could not have trephined
Perfeito com V-ing
I could not have been trephining you could not have been trephining he could not have been trephining we could not have been trephining you could not have been trephining they could not have been trephining
Forma interrogativa
Forma simple
could I trephine? could you trephine? could he trephine? could we trephine? could you trephine? could they trephine?
Forma com V-ing
could I be trephining? could you be trephining? could he be trephining? could we be trephining? could you be trephining? could they be trephining?
Perfeito
could I have trephined? could you have trephined? could he have trephined? could we have trephined? could you have trephined? could they have trephined?
Perfeito com V-ing
could I have been trephining? could you have been trephining? could he have been trephining? could we have been trephining? could you have been trephining? could they have been trephining?
Forma interro-Negação
Forma simple
could I not trephine? could you not trephine? could he not trephine? could we not trephine? could you not trephine? could they not trephine?
Forma com V-ing
could I not be trephining? could you not be trephining? could he not be trephining? could we not be trephining? could you not be trephining? could they not be trephining?
Perfeito
could I not have trephined? could you not have trephined? could he not have trephined? could we not have trephined? could you not have trephined? could they not have trephined?
Perfeito com V-ing
could I not have been trephining? could you not have been trephining? could he not have been trephining? could we not have been trephining? could you not have been trephining? could they not have been trephining?