English verb conjugation COULD BILL

Regular verb: bill - billed - billed

Affirmation

Simple form

I could bill
you could bill
he could bill
we could bill
you could bill
they could bill

V-ing form

I could be billing
you could be billing
he could be billing
we could be billing
you could be billing
they could be billing

Perfect

I could have billed
you could have billed
he could have billed
we could have billed
you could have billed
they could have billed

V-ing perfect

I could have been billing
you could have been billing
he could have been billing
we could have been billing
you could have been billing
they could have been billing

Negation

Simple form

I couldn't bill
you couldn't bill
he couldn't bill
we couldn't bill
you couldn't bill
they couldn't bill

V-ing form

I couldn't be billing
you couldn't be billing
he couldn't be billing
we couldn't be billing
you couldn't be billing
they couldn't be billing

Perfect

I couldn't have billed
you couldn't have billed
he couldn't have billed
we couldn't have billed
you couldn't have billed
they couldn't have billed

V-ing perfect

I couldn't have been billing
you couldn't have been billing
he couldn't have been billing
we couldn't have been billing
you couldn't have been billing
they couldn't have been billing

Interrogative form

Simple form

could I bill?
could you bill?
could he bill?
could we bill?
could you bill?
could they bill?

V-ing form

could I be billing?
could you be billing?
could he be billing?
could we be billing?
could you be billing?
could they be billing?

Perfect

could I have billed?
could you have billed?
could he have billed?
could we have billed?
could you have billed?
could they have billed?

V-ing perfect

could I have been billing?
could you have been billing?
could he have been billing?
could we have been billing?
could you have been billing?
could they have been billing?

Interro-negative form

Simple form

couldn't I bill?
couldn't you bill?
couldn't he bill?
couldn't we bill?
couldn't you bill?
couldn't they bill?

V-ing form

couldn't I be billing?
couldn't you be billing?
couldn't he be billing?
couldn't we be billing?
couldn't you be billing?
couldn't they be billing?

Perfect

couldn't I have billed?
couldn't you have billed?
couldn't he have billed?
couldn't we have billed?
couldn't you have billed?
couldn't they have billed?

V-ing perfect

couldn't I have been billing?
couldn't you have been billing?
couldn't he have been billing?
couldn't we have been billing?
couldn't you have been billing?
couldn't they have been billing?

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