English verb conjugation
COULD PREBILL

Regular verb: prebill - prebilled - prebilled

Affirmation

Simple form	V-ing form
I could prebill you could prebill he could prebill we could prebill you could prebill they could prebill	I could be prebilling you could be prebilling he 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 he 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 he 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 he 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 he 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 he 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 he 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 he prebill? could we prebill? could you prebill? could they prebill?	could I be prebilling? could you be prebilling? could he 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 he 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 he 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 he 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 he 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 he 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 he not have been prebilling? could we not have been prebilling? could you not have been prebilling? could they not have been prebilling?