I could appear you could appear she could appear we could appear you could appear they could appear
Forma com V-ing
I could be appearing you could be appearing she could be appearing we could be appearing you could be appearing they could be appearing
Perfeito
I could have appeared you could have appeared she could have appeared we could have appeared you could have appeared they could have appeared
Perfeito com V-ing
I could have been appearing you could have been appearing she could have been appearing we could have been appearing you could have been appearing they could have been appearing
Negação
Forma simple
I could not appear you could not appear she could not appear we could not appear you could not appear they could not appear
Forma com V-ing
I could not be appearing you could not be appearing she could not be appearing we could not be appearing you could not be appearing they could not be appearing
Perfeito
I could not have appeared you could not have appeared she could not have appeared we could not have appeared you could not have appeared they could not have appeared
Perfeito com V-ing
I could not have been appearing you could not have been appearing she could not have been appearing we could not have been appearing you could not have been appearing they could not have been appearing
Forma interrogativa
Forma simple
could I appear? could you appear? could she appear? could we appear? could you appear? could they appear?
Forma com V-ing
could I be appearing? could you be appearing? could she be appearing? could we be appearing? could you be appearing? could they be appearing?
Perfeito
could I have appeared? could you have appeared? could she have appeared? could we have appeared? could you have appeared? could they have appeared?
Perfeito com V-ing
could I have been appearing? could you have been appearing? could she have been appearing? could we have been appearing? could you have been appearing? could they have been appearing?
Forma interro-Negação
Forma simple
could I not appear? could you not appear? could she not appear? could we not appear? could you not appear? could they not appear?
Forma com V-ing
could I not be appearing? could you not be appearing? could she not be appearing? could we not be appearing? could you not be appearing? could they not be appearing?
Perfeito
could I not have appeared? could you not have appeared? could she not have appeared? could we not have appeared? could you not have appeared? could they not have appeared?
Perfeito com V-ing
could I not have been appearing? could you not have been appearing? could she not have been appearing? could we not have been appearing? could you not have been appearing? could they not have been appearing?