English verb conjugation
CAN QUESTION

Regular verb: question - questioned - questioned

Affirmation

Simple form	V-ing form
I can question you can question she can question we can question you can question they can question	I can be questioning you can be questioning she can be questioning we can be questioning you can be questioning they can be questioning
Perfect	V-ing perfect
I can have questioned you can have questioned she can have questioned we can have questioned you can have questioned they can have questioned	I can have been questioning you can have been questioning she can have been questioning we can have been questioning you can have been questioning they can have been questioning

Negation

Simple form	V-ing form
I cannot question you cannot question she cannot question we cannot question you cannot question they cannot question	I cannot be questioning you cannot be questioning she cannot be questioning we cannot be questioning you cannot be questioning they cannot be questioning
Perfect	V-ing perfect
I cannot have questioned you cannot have questioned she cannot have questioned we cannot have questioned you cannot have questioned they cannot have questioned	I cannot have been questioning you cannot have been questioning she cannot have been questioning we cannot have been questioning you cannot have been questioning they cannot have been questioning

Interrogative form

Simple form	V-ing form
can I question? can you question? can she question? can we question? can you question? can they question?	can I be questioning? can you be questioning? can she be questioning? can we be questioning? can you be questioning? can they be questioning?
Perfect	V-ing perfect
can I have questioned? can you have questioned? can she have questioned? can we have questioned? can you have questioned? can they have questioned?	can I have been questioning? can you have been questioning? can she have been questioning? can we have been questioning? can you have been questioning? can they have been questioning?

Interro-negative form

Simple form	V-ing form
can I not question? can you not question? can she not question? can we not question? can you not question? can they not question?	can I not be questioning? can you not be questioning? can she not be questioning? can we not be questioning? can you not be questioning? can they not be questioning?
Perfect	V-ing perfect
can I not have questioned? can you not have questioned? can she not have questioned? can we not have questioned? can you not have questioned? can they not have questioned?	can I not have been questioning? can you not have been questioning? can she not have been questioning? can we not have been questioning? can you not have been questioning? can they not have been questioning?