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 could not bill
you could not bill
he could not bill
we could not bill
you could not bill
they could not bill

V-ing form

I could not be billing
you could not be billing
he could not be billing
we could not be billing
you could not be billing
they could not be billing

Perfect

I could not have billed
you could not have billed
he could not have billed
we could not have billed
you could not have billed
they could not have billed

V-ing perfect

I could not have been billing
you could not have been billing
he could not have been billing
we could not have been billing
you could not have been billing
they could not 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

could I not bill?
could you not bill?
could he not bill?
could we not bill?
could you not bill?
could they not bill?

V-ing form

could I not be billing?
could you not be billing?
could he not be billing?
could we not be billing?
could you not be billing?
could they not be billing?

Perfect

could I not have billed?
could you not have billed?
could he not have billed?
could we not have billed?
could you not have billed?
could they not have billed?

V-ing perfect

could I not have been billing?
could you not have been billing?
could he not have been billing?
could we not have been billing?
could you not have been billing?
could they not have been billing?

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