could bill
Verbo regolare: bill - billed- billed

Affermazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I could bill
you could bill
she could bill
we could bill
you could bill
they could bill 	I could be billing
you could be billing
she could be billing
we could be billing
you could be billing
they could be billing	I could have billed
you could have billed
she could have billed
we could have billed
you could have billed
they could have billed	I could have been billing
you could have been billing
she could have been billing
we could have been billing
you could have been billing
they could have been billing	

Negazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I could not bill
you could not bill
she could not bill
we could not bill
you could not bill
they could not bill 	I could not be billing
you could not be billing
she could not be billing
we could not be billing
you could not be billing
they could not be billing	I could not have billed
you could not have billed
she could not have billed
we could not have billed
you could not have billed
they could not have billed	I could not have been billing
you could not have been billing
she could not have been billing
we could not have been billing
you could not have been billing
they could not have been billing	

Forma interrogativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
could I bill?
could you bill?
could she bill?
could we bill?
could you bill?
could they bill? 	could I be billing?
could you be billing?
could she be billing?
could we be billing?
could you be billing?
could they be billing? 	could I have billed?
could you have billed?
could she have billed?
could we have billed?
could you have billed?
could they have billed? 	could I have been billing?
could you have been billing?
could she have been billing?
could we have been billing?
could you have been billing?
could they have been billing? 	

Forma interro-negativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
could I not bill?
could you not bill?
could she not bill?
could we not bill?
could you not bill?
could they not bill? 	could I not be billing?
could you not be billing?
could she not be billing?
could we not be billing?
could you not be billing?
could they not be billing? 	could I not have billed?
could you not have billed?
could she not have billed?
could we not have billed?
could you not have billed?
could they not have billed? 	could I not have been billing?
could you not have been billing?
could she not have been billing?
could we not have been billing?
could you not have been billing?
could they not have been billing?