I could question you could question she could question we could question you could question they could question
Forma com V-ing
I could be questioning you could be questioning she could be questioning we could be questioning you could be questioning they could be questioning
Perfeito
I could have questioned you could have questioned she could have questioned we could have questioned you could have questioned they could have questioned
Perfeito com V-ing
I could have been questioning you could have been questioning she could have been questioning we could have been questioning you could have been questioning they could have been questioning
Negação
Forma simple
I could not question you could not question she could not question we could not question you could not question they could not question
Forma com V-ing
I could not be questioning you could not be questioning she could not be questioning we could not be questioning you could not be questioning they could not be questioning
Perfeito
I could not have questioned you could not have questioned she could not have questioned we could not have questioned you could not have questioned they could not have questioned
Perfeito com V-ing
I could not have been questioning you could not have been questioning she could not have been questioning we could not have been questioning you could not have been questioning they could not have been questioning
Forma interrogativa
Forma simple
could I question? could you question? could she question? could we question? could you question? could they question?
Forma com V-ing
could I be questioning? could you be questioning? could she be questioning? could we be questioning? could you be questioning? could they be questioning?
Perfeito
could I have questioned? could you have questioned? could she have questioned? could we have questioned? could you have questioned? could they have questioned?
Perfeito com V-ing
could I have been questioning? could you have been questioning? could she have been questioning? could we have been questioning? could you have been questioning? could they have been questioning?
Forma interro-Negação
Forma simple
could I not question? could you not question? could she not question? could we not question? could you not question? could they not question?
Forma com V-ing
could I not be questioning? could you not be questioning? could she not be questioning? could we not be questioning? could you not be questioning? could they not be questioning?
Perfeito
could I not have questioned? could you not have questioned? could she not have questioned? could we not have questioned? could you not have questioned? could they not have questioned?
Perfeito com V-ing
could I not have been questioning? could you not have been questioning? could she not have been questioning? could we not have been questioning? could you not have been questioning? could they not have been questioning?