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 couldn't upheave you couldn't upheave he couldn't upheave we couldn't upheave you couldn't upheave they couldn't upheave	I couldn't be upheaving you couldn't be upheaving he couldn't be upheaving we couldn't be upheaving you couldn't be upheaving they couldn't be upheaving
Perfect	V-ing perfect
I couldn't have upheaved you couldn't have upheaved he couldn't have upheaved we couldn't have upheaved you couldn't have upheaved they couldn't have upheaved	I couldn't have been upheaving you couldn't have been upheaving he couldn't have been upheaving we couldn't have been upheaving you couldn't have been upheaving they couldn't 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
couldn't I upheave? couldn't you upheave? couldn't he upheave? couldn't we upheave? couldn't you upheave? couldn't they upheave?	couldn't I be upheaving? couldn't you be upheaving? couldn't he be upheaving? couldn't we be upheaving? couldn't you be upheaving? couldn't they be upheaving?
Perfect	V-ing perfect
couldn't I have upheaved? couldn't you have upheaved? couldn't he have upheaved? couldn't we have upheaved? couldn't you have upheaved? couldn't they have upheaved?	couldn't I have been upheaving? couldn't you have been upheaving? couldn't he have been upheaving? couldn't we have been upheaving? couldn't you have been upheaving? couldn't they have been upheaving?