I'd be approximating you'd be approximating he'd be approximating we'd be approximating you'd be approximating they'd be approximating
Perfect
I should've approximated you should've approximated he 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 he 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 he 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 he 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 he 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 he 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 he approximate? should we approximate? should you approximate? should they approximate?
V-ing form
should I be approximating? should you be approximating? should he be approximating? should we be approximating? should you be approximating? should they be approximating?
Perfect
should I have approximated? should you have approximated? should he 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 he 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 he 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 he 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 he 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 he have been approximating? shouldn't we have been approximating? shouldn't you have been approximating? shouldn't they have been approximating?