English verb conjugation
COULD PREBILL

Regular verb: prebill - prebilled - prebilled

Affirmation

Simple form	V-ing form
I could prebill you could prebill she could prebill we could prebill you could prebill they could prebill	I could be prebilling you could be prebilling she could be prebilling we could be prebilling you could be prebilling they could be prebilling
Perfect	V-ing perfect
I could have prebilled you could have prebilled she could have prebilled we could have prebilled you could have prebilled they could have prebilled	I could have been prebilling you could have been prebilling she could have been prebilling we could have been prebilling you could have been prebilling they could have been prebilling

Negation

Simple form	V-ing form
I could not prebill you could not prebill she could not prebill we could not prebill you could not prebill they could not prebill	I could not be prebilling you could not be prebilling she could not be prebilling we could not be prebilling you could not be prebilling they could not be prebilling
Perfect	V-ing perfect
I could not have prebilled you could not have prebilled she could not have prebilled we could not have prebilled you could not have prebilled they could not have prebilled	I could not have been prebilling you could not have been prebilling she could not have been prebilling we could not have been prebilling you could not have been prebilling they could not have been prebilling

Interrogative form

Simple form	V-ing form
could I prebill? could you prebill? could she prebill? could we prebill? could you prebill? could they prebill?	could I be prebilling? could you be prebilling? could she be prebilling? could we be prebilling? could you be prebilling? could they be prebilling?
Perfect	V-ing perfect
could I have prebilled? could you have prebilled? could she have prebilled? could we have prebilled? could you have prebilled? could they have prebilled?	could I have been prebilling? could you have been prebilling? could she have been prebilling? could we have been prebilling? could you have been prebilling? could they have been prebilling?

Interro-negative form

Simple form	V-ing form
could I not prebill? could you not prebill? could she not prebill? could we not prebill? could you not prebill? could they not prebill?	could I not be prebilling? could you not be prebilling? could she not be prebilling? could we not be prebilling? could you not be prebilling? could they not be prebilling?
Perfect	V-ing perfect
could I not have prebilled? could you not have prebilled? could she not have prebilled? could we not have prebilled? could you not have prebilled? could they not have prebilled?	could I not have been prebilling? could you not have been prebilling? could she not have been prebilling? could we not have been prebilling? could you not have been prebilling? could they not have been prebilling?