I could file you could file she could file we could file you could file they could file
Forma con V-ing
I could be filing you could be filing she could be filing we could be filing you could be filing they could be filing
Perfecto
I could have filed you could have filed she could have filed we could have filed you could have filed they could have filed
Perfecto con V-ing
I could have been filing you could have been filing she could have been filing we could have been filing you could have been filing they could have been filing
Negación
Forma simple
I could not file you could not file she could not file we could not file you could not file they could not file
Forma con V-ing
I could not be filing you could not be filing she could not be filing we could not be filing you could not be filing they could not be filing
Perfecto
I could not have filed you could not have filed she could not have filed we could not have filed you could not have filed they could not have filed
Perfecto con V-ing
I could not have been filing you could not have been filing she could not have been filing we could not have been filing you could not have been filing they could not have been filing
Forma interrogativa
Forma simple
could I file? could you file? could she file? could we file? could you file? could they file?
Forma con V-ing
could I be filing? could you be filing? could she be filing? could we be filing? could you be filing? could they be filing?
Perfecto
could I have filed? could you have filed? could she have filed? could we have filed? could you have filed? could they have filed?
Perfecto con V-ing
could I have been filing? could you have been filing? could she have been filing? could we have been filing? could you have been filing? could they have been filing?
Forma interro-negativa
Forma simple
could I not file? could you not file? could she not file? could we not file? could you not file? could they not file?
Forma con V-ing
could I not be filing? could you not be filing? could she not be filing? could we not be filing? could you not be filing? could they not be filing?
Perfecto
could I not have filed? could you not have filed? could she not have filed? could we not have filed? could you not have filed? could they not have filed?
Perfecto con V-ing
could I not have been filing? could you not have been filing? could she not have been filing? could we not have been filing? could you not have been filing? could they not have been filing?