English verb conjugation
SHOULD BILL

Regular verb: bill - billed - billed

Affirmation

Simple form	V-ing form
I'd bill you'd bill he'd bill we'd bill you'd bill they'd bill	I'd be billing you'd be billing he'd be billing we'd be billing you'd be billing they'd be billing
Perfect	V-ing perfect
I should've billed you should've billed he should've billed we should've billed you should've billed they should've billed	I should've been billing you should've been billing he should've been billing we should've been billing you should've been billing they should've been billing

Negation

Simple form	V-ing form
I shouldn't bill you shouldn't bill he shouldn't bill we shouldn't bill you shouldn't bill they shouldn't bill	I shouldn't be billing you shouldn't be billing he shouldn't be billing we shouldn't be billing you shouldn't be billing they shouldn't be billing
Perfect	V-ing perfect
I shouldn't have billed you shouldn't have billed he shouldn't have billed we shouldn't have billed you shouldn't have billed they shouldn't have billed	I shouldn't have been billing you shouldn't have been billing he 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	V-ing form
should I bill? should you bill? should he bill? should we bill? should you bill? should they bill?	should I be billing? should you be billing? should he be billing? should we be billing? should you be billing? should they be billing?
Perfect	V-ing perfect
should I have billed? should you have billed? should he have billed? should we have billed? should you have billed? should they have billed?	should I have been billing? should you have been billing? should he have been billing? should we have been billing? should you have been billing? should they have been billing?

Interro-negative form

Simple form	V-ing form
shouldn't I bill? shouldn't you bill? shouldn't he bill? shouldn't we bill? shouldn't you bill? shouldn't they bill?	shouldn't I be billing? shouldn't you be billing? shouldn't he be billing? shouldn't we be billing? shouldn't you be billing? shouldn't they be billing?
Perfect	V-ing perfect
shouldn't I have billed? shouldn't you have billed? shouldn't he have billed? shouldn't we have billed? shouldn't you have billed? shouldn't they have billed?	shouldn't I have been billing? shouldn't you have been billing? shouldn't he have been billing? shouldn't we have been billing? shouldn't you have been billing? shouldn't they have been billing?