can bill
Regular verb: bill - billed- billed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can bill
you can bill
she can bill
we can bill
you can bill
they can bill 	I can be billing
you can be billing
she can be billing
we can be billing
you can be billing
they can be billing	I can have billed
you can have billed
she 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
she can have been billing
we can have been billing
you can have been billing
they can have been billing	

Negation 	
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I can't bill
you can't bill
she 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
she 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
she 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
she can't have been billing
we can't have been billing
you can't have been billing
they can't have been billing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I bill?
can you bill?
can she bill?
can we bill?
can you bill?
can they bill? 	can I be billing?
can you be billing?
can she be billing?
can we be billing?
can you be billing?
can they be billing? 	can I have billed?
can you have billed?
can she 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 she have been billing?
can we have been billing?
can you have been billing?
can they have been billing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can't I bill?
can't you bill?
can't she 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 she 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 she 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 she have been billing?
can't we have been billing?
can't you have been billing?
can't they have been billing?