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

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

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