I can bill you can bill he can bill we can bill you can bill they can bill
Forma con V-ing
I can be billing you can be billing he can be billing we can be billing you can be billing they can be billing
Perfecto
I can have billed you can have billed he can have billed we can have billed you can have billed they can have billed
Perfecto con V-ing
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
Negación
Forma simple
I can't bill you can't bill he can't bill we can't bill you can't bill they can't bill
Forma con V-ing
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
Perfecto
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
Perfecto con V-ing
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
can I bill? can you bill? can he bill? can we bill? can you bill? can they bill?
Forma con V-ing
can I be billing? can you be billing? can he be billing? can we be billing? can you be billing? can they be billing?
Perfecto
can I have billed? can you have billed? can he have billed? can we have billed? can you have billed? can they have billed?
Perfecto con V-ing
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-negativa
Forma simple
can't I bill? can't you bill? can't he bill? can't we bill? can't you bill? can't they bill?
Forma con V-ing
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?
Perfecto
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?
Perfecto con V-ing
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?