English verb conjugation
COULD UPHEAVE

Regular verb: upheave - upheaved - upheaved

Affirmation

Simple form	V-ing form
I could upheave you could upheave she could upheave we could upheave you could upheave they could upheave	I could be upheaving you could be upheaving she 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 she 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 she 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 she 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 she 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 she 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 she 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 she upheave? could we upheave? could you upheave? could they upheave?	could I be upheaving? could you be upheaving? could she 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 she 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 she 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 she 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 she 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 she 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 she have been upheaving? couldn't we have been upheaving? couldn't you have been upheaving? couldn't they have been upheaving?