could bill
Verbe régulier : bill - billed- billed
Traduction française : facturer - becqueter 

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en 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	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I couldn't bill
you couldn't bill
she couldn't bill
we couldn't bill
you couldn't bill
they couldn't bill 	I couldn't be billing
you couldn't be billing
she couldn't be billing
we couldn't be billing
you couldn't be billing
they couldn't be billing	I couldn't have billed
you couldn't have billed
she couldn't have billed
we couldn't have billed
you couldn't have billed
they couldn't have billed	I couldn't have been billing
you couldn't have been billing
she couldn't have been billing
we couldn't have been billing
you couldn't have been billing
they couldn't have been billing	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en 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? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
couldn't I bill?
couldn't you bill?
couldn't she bill?
couldn't we bill?
couldn't you bill?
couldn't they bill? 	couldn't I be billing?
couldn't you be billing?
couldn't she be billing?
couldn't we be billing?
couldn't you be billing?
couldn't they be billing? 	couldn't I have billed?
couldn't you have billed?
couldn't she have billed?
couldn't we have billed?
couldn't you have billed?
couldn't they have billed? 	couldn't I have been billing?
couldn't you have been billing?
couldn't she have been billing?
couldn't we have been billing?
couldn't you have been billing?
couldn't they have been billing?