should bill
Verbo regular: bill - billed- billed

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
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	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	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
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	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	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
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? 	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? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
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? 	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?