must bill
Verbo regolare: bill - billed- billed

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

Negazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I mustn't bill
you mustn't bill
he mustn't bill
we mustn't bill
you mustn't bill
they mustn't bill 	I mustn't be billing
you mustn't be billing
he mustn't be billing
we mustn't be billing
you mustn't be billing
they mustn't be billing	I mustn't have billed
you mustn't have billed
he mustn't have billed
we mustn't have billed
you mustn't have billed
they mustn't have billed	I mustn't have been billing
you mustn't have been billing
he mustn't have been billing
we mustn't have been billing
you mustn't have been billing
they mustn't have been billing	

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

Forma interro-negativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
mustn't I bill?
mustn't you bill?
mustn't he bill?
mustn't we bill?
mustn't you bill?
mustn't they bill? 	mustn't I be billing?
mustn't you be billing?
mustn't he be billing?
mustn't we be billing?
mustn't you be billing?
mustn't they be billing? 	mustn't I have billed?
mustn't you have billed?
mustn't he have billed?
mustn't we have billed?
mustn't you have billed?
mustn't they have billed? 	mustn't I have been billing?
mustn't you have been billing?
mustn't he have been billing?
mustn't we have been billing?
mustn't you have been billing?
mustn't they have been billing?