could double-bill
Verbo regular: double-bill - double-billed- double-billed

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could double-bill
you could double-bill
he could double-bill
we could double-bill
you could double-bill
they could double-bill 	I could be double-billing
you could be double-billing
he could be double-billing
we could be double-billing
you could be double-billing
they could be double-billing	I could have double-billed
you could have double-billed
he could have double-billed
we could have double-billed
you could have double-billed
they could have double-billed	I could have been double-billing
you could have been double-billing
he could have been double-billing
we could have been double-billing
you could have been double-billing
they could have been double-billing	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could not double-bill
you could not double-bill
he could not double-bill
we could not double-bill
you could not double-bill
they could not double-bill 	I could not be double-billing
you could not be double-billing
he could not be double-billing
we could not be double-billing
you could not be double-billing
they could not be double-billing	I could not have double-billed
you could not have double-billed
he could not have double-billed
we could not have double-billed
you could not have double-billed
they could not have double-billed	I could not have been double-billing
you could not have been double-billing
he could not have been double-billing
we could not have been double-billing
you could not have been double-billing
they could not have been double-billing	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I double-bill?
could you double-bill?
could he double-bill?
could we double-bill?
could you double-bill?
could they double-bill? 	could I be double-billing?
could you be double-billing?
could he be double-billing?
could we be double-billing?
could you be double-billing?
could they be double-billing? 	could I have double-billed?
could you have double-billed?
could he have double-billed?
could we have double-billed?
could you have double-billed?
could they have double-billed? 	could I have been double-billing?
could you have been double-billing?
could he have been double-billing?
could we have been double-billing?
could you have been double-billing?
could they have been double-billing? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I not double-bill?
could you not double-bill?
could he not double-bill?
could we not double-bill?
could you not double-bill?
could they not double-bill? 	could I not be double-billing?
could you not be double-billing?
could he not be double-billing?
could we not be double-billing?
could you not be double-billing?
could they not be double-billing? 	could I not have double-billed?
could you not have double-billed?
could he not have double-billed?
could we not have double-billed?
could you not have double-billed?
could they not have double-billed? 	could I not have been double-billing?
could you not have been double-billing?
could he not have been double-billing?
could we not have been double-billing?
could you not have been double-billing?
could they not have been double-billing?