should double-bill
Regular verb: double-bill - double-billed- double-billed

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

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

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
should I double-bill?
should you double-bill?
should he double-bill?
should we double-bill?
should you double-bill?
should they double-bill? 	should I be double-billing?
should you be double-billing?
should he be double-billing?
should we be double-billing?
should you be double-billing?
should they be double-billing? 	should I have double-billed?
should you have double-billed?
should he have double-billed?
should we have double-billed?
should you have double-billed?
should they have double-billed? 	should I have been double-billing?
should you have been double-billing?
should he have been double-billing?
should we have been double-billing?
should you have been double-billing?
should they have been double-billing? 	

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