English verb conjugation
COULD UPHEAVE

Regular verb: upheave - upheaved - upheaved

Affirmation

Simple form	V-ing form
I could upheave you could upheave he could upheave we could upheave you could upheave they could upheave	I could be upheaving you could be upheaving he could be upheaving we could be upheaving you could be upheaving they could be upheaving
Perfect	V-ing perfect
I could have upheaved you could have upheaved he could have upheaved we could have upheaved you could have upheaved they could have upheaved	I could have been upheaving you could have been upheaving he could have been upheaving we could have been upheaving you could have been upheaving they could have been upheaving

Negation

Simple form	V-ing form
I could not upheave you could not upheave he could not upheave we could not upheave you could not upheave they could not upheave	I could not be upheaving you could not be upheaving he could not be upheaving we could not be upheaving you could not be upheaving they could not be upheaving
Perfect	V-ing perfect
I could not have upheaved you could not have upheaved he could not have upheaved we could not have upheaved you could not have upheaved they could not have upheaved	I could not have been upheaving you could not have been upheaving he could not have been upheaving we could not have been upheaving you could not have been upheaving they could not have been upheaving

Interrogative form

Simple form	V-ing form
could I upheave? could you upheave? could he upheave? could we upheave? could you upheave? could they upheave?	could I be upheaving? could you be upheaving? could he be upheaving? could we be upheaving? could you be upheaving? could they be upheaving?
Perfect	V-ing perfect
could I have upheaved? could you have upheaved? could he have upheaved? could we have upheaved? could you have upheaved? could they have upheaved?	could I have been upheaving? could you have been upheaving? could he have been upheaving? could we have been upheaving? could you have been upheaving? could they have been upheaving?

Interro-negative form

Simple form	V-ing form
could I not upheave? could you not upheave? could he not upheave? could we not upheave? could you not upheave? could they not upheave?	could I not be upheaving? could you not be upheaving? could he not be upheaving? could we not be upheaving? could you not be upheaving? could they not be upheaving?
Perfect	V-ing perfect
could I not have upheaved? could you not have upheaved? could he not have upheaved? could we not have upheaved? could you not have upheaved? could they not have upheaved?	could I not have been upheaving? could you not have been upheaving? could he not have been upheaving? could we not have been upheaving? could you not have been upheaving? could they not have been upheaving?