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