English verb conjugation
COULD UPSTAGE

Regular verb: upstage - upstaged - upstaged

Affirmation

Simple form	V-ing form
I could upstage you could upstage he could upstage we could upstage you could upstage they could upstage	I could be upstaging you could be upstaging he could be upstaging we could be upstaging you could be upstaging they could be upstaging
Perfect	V-ing perfect
I could have upstaged you could have upstaged he could have upstaged we could have upstaged you could have upstaged they could have upstaged	I could have been upstaging you could have been upstaging he could have been upstaging we could have been upstaging you could have been upstaging they could have been upstaging

Negation

Simple form	V-ing form
I could not upstage you could not upstage he could not upstage we could not upstage you could not upstage they could not upstage	I could not be upstaging you could not be upstaging he could not be upstaging we could not be upstaging you could not be upstaging they could not be upstaging
Perfect	V-ing perfect
I could not have upstaged you could not have upstaged he could not have upstaged we could not have upstaged you could not have upstaged they could not have upstaged	I could not have been upstaging you could not have been upstaging he could not have been upstaging we could not have been upstaging you could not have been upstaging they could not have been upstaging

Interrogative form

Simple form	V-ing form
could I upstage? could you upstage? could he upstage? could we upstage? could you upstage? could they upstage?	could I be upstaging? could you be upstaging? could he be upstaging? could we be upstaging? could you be upstaging? could they be upstaging?
Perfect	V-ing perfect
could I have upstaged? could you have upstaged? could he have upstaged? could we have upstaged? could you have upstaged? could they have upstaged?	could I have been upstaging? could you have been upstaging? could he have been upstaging? could we have been upstaging? could you have been upstaging? could they have been upstaging?

Interro-negative form

Simple form	V-ing form
could I not upstage? could you not upstage? could he not upstage? could we not upstage? could you not upstage? could they not upstage?	could I not be upstaging? could you not be upstaging? could he not be upstaging? could we not be upstaging? could you not be upstaging? could they not be upstaging?
Perfect	V-ing perfect
could I not have upstaged? could you not have upstaged? could he not have upstaged? could we not have upstaged? could you not have upstaged? could they not have upstaged?	could I not have been upstaging? could you not have been upstaging? could he not have been upstaging? could we not have been upstaging? could you not have been upstaging? could they not have been upstaging?