I'd be approximating you'd be approximating she'd be approximating we'd be approximating you'd be approximating they'd be approximating
Perfect
I should've approximated you should've approximated she should've approximated we should've approximated you should've approximated they should've approximated
V-ing perfect
I should've been approximating you should've been approximating she should've been approximating we should've been approximating you should've been approximating they should've been approximating
Negation
Simple form
I shouldn't approximate you shouldn't approximate she shouldn't approximate we shouldn't approximate you shouldn't approximate they shouldn't approximate
V-ing form
I shouldn't be approximating you shouldn't be approximating she shouldn't be approximating we shouldn't be approximating you shouldn't be approximating they shouldn't be approximating
Perfect
I shouldn't have approximated you shouldn't have approximated she shouldn't have approximated we shouldn't have approximated you shouldn't have approximated they shouldn't have approximated
V-ing perfect
I shouldn't have been approximating you shouldn't have been approximating she shouldn't have been approximating we shouldn't have been approximating you shouldn't have been approximating they shouldn't have been approximating
Interrogative form
Simple form
should I approximate? should you approximate? should she approximate? should we approximate? should you approximate? should they approximate?
V-ing form
should I be approximating? should you be approximating? should she be approximating? should we be approximating? should you be approximating? should they be approximating?
Perfect
should I have approximated? should you have approximated? should she have approximated? should we have approximated? should you have approximated? should they have approximated?
V-ing perfect
should I have been approximating? should you have been approximating? should she have been approximating? should we have been approximating? should you have been approximating? should they have been approximating?
Interro-negative form
Simple form
shouldn't I approximate? shouldn't you approximate? shouldn't she approximate? shouldn't we approximate? shouldn't you approximate? shouldn't they approximate?
V-ing form
shouldn't I be approximating? shouldn't you be approximating? shouldn't she be approximating? shouldn't we be approximating? shouldn't you be approximating? shouldn't they be approximating?
Perfect
shouldn't I have approximated? shouldn't you have approximated? shouldn't she have approximated? shouldn't we have approximated? shouldn't you have approximated? shouldn't they have approximated?
V-ing perfect
shouldn't I have been approximating? shouldn't you have been approximating? shouldn't she have been approximating? shouldn't we have been approximating? shouldn't you have been approximating? shouldn't they have been approximating?