English verb conjugation
COULD OVERBILL

Regular verb: overbill - overbilled - overbilled

Affirmation

Simple form	V-ing form
I could overbill you could overbill he could overbill we could overbill you could overbill they could overbill	I could be overbilling you could be overbilling he could be overbilling we could be overbilling you could be overbilling they could be overbilling
Perfect	V-ing perfect
I could have overbilled you could have overbilled he could have overbilled we could have overbilled you could have overbilled they could have overbilled	I could have been overbilling you could have been overbilling he could have been overbilling we could have been overbilling you could have been overbilling they could have been overbilling

Negation

Simple form	V-ing form
I could not overbill you could not overbill he could not overbill we could not overbill you could not overbill they could not overbill	I could not be overbilling you could not be overbilling he could not be overbilling we could not be overbilling you could not be overbilling they could not be overbilling
Perfect	V-ing perfect
I could not have overbilled you could not have overbilled he could not have overbilled we could not have overbilled you could not have overbilled they could not have overbilled	I could not have been overbilling you could not have been overbilling he could not have been overbilling we could not have been overbilling you could not have been overbilling they could not have been overbilling

Interrogative form

Simple form	V-ing form
could I overbill? could you overbill? could he overbill? could we overbill? could you overbill? could they overbill?	could I be overbilling? could you be overbilling? could he be overbilling? could we be overbilling? could you be overbilling? could they be overbilling?
Perfect	V-ing perfect
could I have overbilled? could you have overbilled? could he have overbilled? could we have overbilled? could you have overbilled? could they have overbilled?	could I have been overbilling? could you have been overbilling? could he have been overbilling? could we have been overbilling? could you have been overbilling? could they have been overbilling?

Interro-negative form

Simple form	V-ing form
could I not overbill? could you not overbill? could he not overbill? could we not overbill? could you not overbill? could they not overbill?	could I not be overbilling? could you not be overbilling? could he not be overbilling? could we not be overbilling? could you not be overbilling? could they not be overbilling?
Perfect	V-ing perfect
could I not have overbilled? could you not have overbilled? could he not have overbilled? could we not have overbilled? could you not have overbilled? could they not have overbilled?	could I not have been overbilling? could you not have been overbilling? could he not have been overbilling? could we not have been overbilling? could you not have been overbilling? could they not have been overbilling?