I could ask you could ask he could ask we could ask you could ask they could ask
Forma com V-ing
I could be asking you could be asking he could be asking we could be asking you could be asking they could be asking
Perfeito
I could have asked you could have asked he could have asked we could have asked you could have asked they could have asked
Perfeito com V-ing
I could have been asking you could have been asking he could have been asking we could have been asking you could have been asking they could have been asking
Negação
Forma simple
I could not ask you could not ask he could not ask we could not ask you could not ask they could not ask
Forma com V-ing
I could not be asking you could not be asking he could not be asking we could not be asking you could not be asking they could not be asking
Perfeito
I could not have asked you could not have asked he could not have asked we could not have asked you could not have asked they could not have asked
Perfeito com V-ing
I could not have been asking you could not have been asking he could not have been asking we could not have been asking you could not have been asking they could not have been asking
Forma interrogativa
Forma simple
could I ask? could you ask? could he ask? could we ask? could you ask? could they ask?
Forma com V-ing
could I be asking? could you be asking? could he be asking? could we be asking? could you be asking? could they be asking?
Perfeito
could I have asked? could you have asked? could he have asked? could we have asked? could you have asked? could they have asked?
Perfeito com V-ing
could I have been asking? could you have been asking? could he have been asking? could we have been asking? could you have been asking? could they have been asking?
Forma interro-Negação
Forma simple
could I not ask? could you not ask? could he not ask? could we not ask? could you not ask? could they not ask?
Forma com V-ing
could I not be asking? could you not be asking? could he not be asking? could we not be asking? could you not be asking? could they not be asking?
Perfeito
could I not have asked? could you not have asked? could he not have asked? could we not have asked? could you not have asked? could they not have asked?
Perfeito com V-ing
could I not have been asking? could you not have been asking? could he not have been asking? could we not have been asking? could you not have been asking? could they not have been asking?