English verb conjugation
COULD QUESTION

Regular verb: question - questioned - questioned

Affirmation

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

Negation

Simple form	V-ing form
I couldn't question you couldn't question he couldn't question we couldn't question you couldn't question they couldn't question	I couldn't be questioning you couldn't be questioning he couldn't be questioning we couldn't be questioning you couldn't be questioning they couldn't be questioning
Perfect	V-ing perfect
I couldn't have questioned you couldn't have questioned he couldn't have questioned we couldn't have questioned you couldn't have questioned they couldn't have questioned	I couldn't have been questioning you couldn't have been questioning he couldn't have been questioning we couldn't have been questioning you couldn't have been questioning they couldn't have been questioning

Interrogative form

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

Interro-negative form

Simple form	V-ing form
couldn't I question? couldn't you question? couldn't he question? couldn't we question? couldn't you question? couldn't they question?	couldn't I be questioning? couldn't you be questioning? couldn't he be questioning? couldn't we be questioning? couldn't you be questioning? couldn't they be questioning?
Perfect	V-ing perfect
couldn't I have questioned? couldn't you have questioned? couldn't he have questioned? couldn't we have questioned? couldn't you have questioned? couldn't they have questioned?	couldn't I have been questioning? couldn't you have been questioning? couldn't he have been questioning? couldn't we have been questioning? couldn't you have been questioning? couldn't they have been questioning?