I'd be questioning you'd be questioning he'd be questioning we'd be questioning you'd be questioning they'd be questioning
Perfect
I should've questioned you should've questioned he should've questioned we should've questioned you should've questioned they should've questioned
V-ing perfect
I should've been questioning you should've been questioning he should've been questioning we should've been questioning you should've been questioning they should've been questioning
Negation
Simple form
I shouldn't question you shouldn't question he shouldn't question we shouldn't question you shouldn't question they shouldn't question
V-ing form
I shouldn't be questioning you shouldn't be questioning he shouldn't be questioning we shouldn't be questioning you shouldn't be questioning they shouldn't be questioning
Perfect
I shouldn't have questioned you shouldn't have questioned he shouldn't have questioned we shouldn't have questioned you shouldn't have questioned they shouldn't have questioned
V-ing perfect
I shouldn't have been questioning you shouldn't have been questioning he shouldn't have been questioning we shouldn't have been questioning you shouldn't have been questioning they shouldn't have been questioning
Interrogative form
Simple form
should I question? should you question? should he question? should we question? should you question? should they question?
V-ing form
should I be questioning? should you be questioning? should he be questioning? should we be questioning? should you be questioning? should they be questioning?
Perfect
should I have questioned? should you have questioned? should he have questioned? should we have questioned? should you have questioned? should they have questioned?
V-ing perfect
should I have been questioning? should you have been questioning? should he have been questioning? should we have been questioning? should you have been questioning? should they have been questioning?
Interro-negative form
Simple form
shouldn't I question? shouldn't you question? shouldn't he question? shouldn't we question? shouldn't you question? shouldn't they question?
V-ing form
shouldn't I be questioning? shouldn't you be questioning? shouldn't he be questioning? shouldn't we be questioning? shouldn't you be questioning? shouldn't they be questioning?
Perfect
shouldn't I have questioned? shouldn't you have questioned? shouldn't he have questioned? shouldn't we have questioned? shouldn't you have questioned? shouldn't they have questioned?
V-ing perfect
shouldn't I have been questioning? shouldn't you have been questioning? shouldn't he have been questioning? shouldn't we have been questioning? shouldn't you have been questioning? shouldn't they have been questioning?