Cuidado, este verbo pode não existir, a conjugação é dada como exemplo.
Afirmação
Forma simple
I could do do you could do do he could do do we could do do you could do do they could do do
Forma com V-ing
I could be do doing you could be do doing he could be do doing we could be do doing you could be do doing they could be do doing
Perfeito
I could have do doed you could have do doed he could have do doed we could have do doed you could have do doed they could have do doed
Perfeito com V-ing
I could have been do doing you could have been do doing he could have been do doing we could have been do doing you could have been do doing they could have been do doing
Negação
Forma simple
I could not do do you could not do do he could not do do we could not do do you could not do do they could not do do
Forma com V-ing
I could not be do doing you could not be do doing he could not be do doing we could not be do doing you could not be do doing they could not be do doing
Perfeito
I could not have do doed you could not have do doed he could not have do doed we could not have do doed you could not have do doed they could not have do doed
Perfeito com V-ing
I could not have been do doing you could not have been do doing he could not have been do doing we could not have been do doing you could not have been do doing they could not have been do doing
Forma interrogativa
Forma simple
could I do do? could you do do? could he do do? could we do do? could you do do? could they do do?
Forma com V-ing
could I be do doing? could you be do doing? could he be do doing? could we be do doing? could you be do doing? could they be do doing?
Perfeito
could I have do doed? could you have do doed? could he have do doed? could we have do doed? could you have do doed? could they have do doed?
Perfeito com V-ing
could I have been do doing? could you have been do doing? could he have been do doing? could we have been do doing? could you have been do doing? could they have been do doing?
Forma interro-Negação
Forma simple
could I not do do? could you not do do? could he not do do? could we not do do? could you not do do? could they not do do?
Forma com V-ing
could I not be do doing? could you not be do doing? could he not be do doing? could we not be do doing? could you not be do doing? could they not be do doing?
Perfeito
could I not have do doed? could you not have do doed? could he not have do doed? could we not have do doed? could you not have do doed? could they not have do doed?
Perfeito com V-ing
could I not have been do doing? could you not have been do doing? could he not have been do doing? could we not have been do doing? could you not have been do doing? could they not have been do doing?