can question
Regular verb: question - questioned- questioned

Affirmation 	
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I can question
you can question
he can question
we can question
you can question
they can question 	I can be questioning
you can be questioning
he can be questioning
we can be questioning
you can be questioning
they can be questioning	I can have questioned
you can have questioned
he 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
he can have been questioning
we can have been questioning
you can have been questioning
they can have been questioning	

Negation 	
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I can't question
you can't question
he can't question
we can't question
you can't question
they can't question 	I can't be questioning
you can't be questioning
he can't be questioning
we can't be questioning
you can't be questioning
they can't be questioning	I can't have questioned
you can't have questioned
he can't have questioned
we can't have questioned
you can't have questioned
they can't have questioned	I can't have been questioning
you can't have been questioning
he can't have been questioning
we can't have been questioning
you can't have been questioning
they can't have been questioning	

Interrogative form 	
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can I question?
can you question?
can he question?
can we question?
can you question?
can they question? 	can I be questioning?
can you be questioning?
can he be questioning?
can we be questioning?
can you be questioning?
can they be questioning? 	can I have questioned?
can you have questioned?
can he 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 he have been questioning?
can we have been questioning?
can you have been questioning?
can they have been questioning? 	

Interro-negative form 	
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can't I question?
can't you question?
can't he question?
can't we question?
can't you question?
can't they question? 	can't I be questioning?
can't you be questioning?
can't he be questioning?
can't we be questioning?
can't you be questioning?
can't they be questioning? 	can't I have questioned?
can't you have questioned?
can't he have questioned?
can't we have questioned?
can't you have questioned?
can't they have questioned? 	can't I have been questioning?
can't you have been questioning?
can't he have been questioning?
can't we have been questioning?
can't you have been questioning?
can't they have been questioning?