can bill
Verbo regular: bill - billed- billed

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

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I can't bill
you can't bill
he can't bill
we can't bill
you can't bill
they can't bill 	I can't be billing
you can't be billing
he can't be billing
we can't be billing
you can't be billing
they can't be billing	I can't have billed
you can't have billed
he can't have billed
we can't have billed
you can't have billed
they can't have billed	I can't have been billing
you can't have been billing
he can't have been billing
we can't have been billing
you can't have been billing
they can't have been billing	

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

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
can't I bill?
can't you bill?
can't he bill?
can't we bill?
can't you bill?
can't they bill? 	can't I be billing?
can't you be billing?
can't he be billing?
can't we be billing?
can't you be billing?
can't they be billing? 	can't I have billed?
can't you have billed?
can't he have billed?
can't we have billed?
can't you have billed?
can't they have billed? 	can't I have been billing?
can't you have been billing?
can't he have been billing?
can't we have been billing?
can't you have been billing?
can't they have been billing?