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 couldn't upstage you couldn't upstage he couldn't upstage we couldn't upstage you couldn't upstage they couldn't upstage	I couldn't be upstaging you couldn't be upstaging he couldn't be upstaging we couldn't be upstaging you couldn't be upstaging they couldn't be upstaging
Perfect	V-ing perfect
I couldn't have upstaged you couldn't have upstaged he couldn't have upstaged we couldn't have upstaged you couldn't have upstaged they couldn't have upstaged	I couldn't have been upstaging you couldn't have been upstaging he couldn't have been upstaging we couldn't have been upstaging you couldn't have been upstaging they couldn't 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
couldn't I upstage? couldn't you upstage? couldn't he upstage? couldn't we upstage? couldn't you upstage? couldn't they upstage?	couldn't I be upstaging? couldn't you be upstaging? couldn't he be upstaging? couldn't we be upstaging? couldn't you be upstaging? couldn't they be upstaging?
Perfect	V-ing perfect
couldn't I have upstaged? couldn't you have upstaged? couldn't he have upstaged? couldn't we have upstaged? couldn't you have upstaged? couldn't they have upstaged?	couldn't I have been upstaging? couldn't you have been upstaging? couldn't he have been upstaging? couldn't we have been upstaging? couldn't you have been upstaging? couldn't they have been upstaging?