I could preexist you could preexist he could preexist we could preexist you could preexist they could preexist
Forma com V-ing
I could be preexisting you could be preexisting he could be preexisting we could be preexisting you could be preexisting they could be preexisting
Perfeito
I could have preexisted you could have preexisted he could have preexisted we could have preexisted you could have preexisted they could have preexisted
Perfeito com V-ing
I could have been preexisting you could have been preexisting he could have been preexisting we could have been preexisting you could have been preexisting they could have been preexisting
Negação
Forma simple
I could not preexist you could not preexist he could not preexist we could not preexist you could not preexist they could not preexist
Forma com V-ing
I could not be preexisting you could not be preexisting he could not be preexisting we could not be preexisting you could not be preexisting they could not be preexisting
Perfeito
I could not have preexisted you could not have preexisted he could not have preexisted we could not have preexisted you could not have preexisted they could not have preexisted
Perfeito com V-ing
I could not have been preexisting you could not have been preexisting he could not have been preexisting we could not have been preexisting you could not have been preexisting they could not have been preexisting
Forma interrogativa
Forma simple
could I preexist? could you preexist? could he preexist? could we preexist? could you preexist? could they preexist?
Forma com V-ing
could I be preexisting? could you be preexisting? could he be preexisting? could we be preexisting? could you be preexisting? could they be preexisting?
Perfeito
could I have preexisted? could you have preexisted? could he have preexisted? could we have preexisted? could you have preexisted? could they have preexisted?
Perfeito com V-ing
could I have been preexisting? could you have been preexisting? could he have been preexisting? could we have been preexisting? could you have been preexisting? could they have been preexisting?
Forma interro-Negação
Forma simple
could I not preexist? could you not preexist? could he not preexist? could we not preexist? could you not preexist? could they not preexist?
Forma com V-ing
could I not be preexisting? could you not be preexisting? could he not be preexisting? could we not be preexisting? could you not be preexisting? could they not be preexisting?
Perfeito
could I not have preexisted? could you not have preexisted? could he not have preexisted? could we not have preexisted? could you not have preexisted? could they not have preexisted?
Perfeito com V-ing
could I not have been preexisting? could you not have been preexisting? could he not have been preexisting? could we not have been preexisting? could you not have been preexisting? could they not have been preexisting?