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