I could visit you could visit he could visit we could visit you could visit they could visit
Forma com V-ing
I could be visiting you could be visiting he could be visiting we could be visiting you could be visiting they could be visiting
Perfeito
I could have visited you could have visited he could have visited we could have visited you could have visited they could have visited
Perfeito com V-ing
I could have been visiting you could have been visiting he could have been visiting we could have been visiting you could have been visiting they could have been visiting
Negação
Forma simple
I could not visit you could not visit he could not visit we could not visit you could not visit they could not visit
Forma com V-ing
I could not be visiting you could not be visiting he could not be visiting we could not be visiting you could not be visiting they could not be visiting
Perfeito
I could not have visited you could not have visited he could not have visited we could not have visited you could not have visited they could not have visited
Perfeito com V-ing
I could not have been visiting you could not have been visiting he could not have been visiting we could not have been visiting you could not have been visiting they could not have been visiting
Forma interrogativa
Forma simple
could I visit? could you visit? could he visit? could we visit? could you visit? could they visit?
Forma com V-ing
could I be visiting? could you be visiting? could he be visiting? could we be visiting? could you be visiting? could they be visiting?
Perfeito
could I have visited? could you have visited? could he have visited? could we have visited? could you have visited? could they have visited?
Perfeito com V-ing
could I have been visiting? could you have been visiting? could he have been visiting? could we have been visiting? could you have been visiting? could they have been visiting?
Forma interro-Negação
Forma simple
could I not visit? could you not visit? could he not visit? could we not visit? could you not visit? could they not visit?
Forma com V-ing
could I not be visiting? could you not be visiting? could he not be visiting? could we not be visiting? could you not be visiting? could they not be visiting?
Perfeito
could I not have visited? could you not have visited? could he not have visited? could we not have visited? could you not have visited? could they not have visited?
Perfeito com V-ing
could I not have been visiting? could you not have been visiting? could he not have been visiting? could we not have been visiting? could you not have been visiting? could they not have been visiting?