English verb conjugation
SHOULD BILL

Regular verb: bill - billed - billed

Affirmation

Simple form	V-ing form
I should bill you should bill she should bill we should bill you should bill they should bill	I should be billing you should be billing she should be billing we should be billing you should be billing they should be billing
Perfect	V-ing perfect
I should have billed you should have billed she should have billed we should have billed you should have billed they should have billed	I should have been billing you should have been billing she should have been billing we should have been billing you should have been billing they should have been billing

Negation

Simple form	V-ing form
I should not bill you should not bill she should not bill we should not bill you should not bill they should not bill	I should not be billing you should not be billing she should not be billing we should not be billing you should not be billing they should not be billing
Perfect	V-ing perfect
I should not have billed you should not have billed she should not have billed we should not have billed you should not have billed they should not have billed	I should not have been billing you should not have been billing she should not have been billing we should not have been billing you should not have been billing they should not have been billing

Interrogative form

Simple form	V-ing form
should I bill? should you bill? should she bill? should we bill? should you bill? should they bill?	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	V-ing 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?	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	V-ing form
should I not bill? should you not bill? should she not bill? should we not bill? should you not bill? should they not bill?	should I not be billing? should you not be billing? should she not be billing? should we not be billing? should you not be billing? should they not be billing?
Perfect	V-ing perfect
should I not have billed? should you not have billed? should she not have billed? should we not have billed? should you not have billed? should they not have billed?	should I not have been billing? should you not have been billing? should she not have been billing? should we not have been billing? should you not have been billing? should they not have been billing?