can double-bill
Regular verb: double-bill - double-billed- double-billed

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

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I cannot double-bill
you cannot double-bill
she cannot double-bill
we cannot double-bill
you cannot double-bill
they cannot double-bill 	I cannot be double-billing
you cannot be double-billing
she cannot be double-billing
we cannot be double-billing
you cannot be double-billing
they cannot be double-billing	I cannot have double-billed
you cannot have double-billed
she cannot have double-billed
we cannot have double-billed
you cannot have double-billed
they cannot have double-billed	I cannot have been double-billing
you cannot have been double-billing
she cannot have been double-billing
we cannot have been double-billing
you cannot have been double-billing
they cannot have been double-billing	

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

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