English verb conjugation
COULD UPEND

Regular verb: upend - upended - upended

Affirmation

Simple form	V-ing form
I could upend you could upend he could upend we could upend you could upend they could upend	I could be upending you could be upending he could be upending we could be upending you could be upending they could be upending
Perfect	V-ing perfect
I could have upended you could have upended he could have upended we could have upended you could have upended they could have upended	I could have been upending you could have been upending he could have been upending we could have been upending you could have been upending they could have been upending

Negation

Simple form	V-ing form
I couldn't upend you couldn't upend he couldn't upend we couldn't upend you couldn't upend they couldn't upend	I couldn't be upending you couldn't be upending he couldn't be upending we couldn't be upending you couldn't be upending they couldn't be upending
Perfect	V-ing perfect
I couldn't have upended you couldn't have upended he couldn't have upended we couldn't have upended you couldn't have upended they couldn't have upended	I couldn't have been upending you couldn't have been upending he couldn't have been upending we couldn't have been upending you couldn't have been upending they couldn't have been upending

Interrogative form

Simple form	V-ing form
could I upend? could you upend? could he upend? could we upend? could you upend? could they upend?	could I be upending? could you be upending? could he be upending? could we be upending? could you be upending? could they be upending?
Perfect	V-ing perfect
could I have upended? could you have upended? could he have upended? could we have upended? could you have upended? could they have upended?	could I have been upending? could you have been upending? could he have been upending? could we have been upending? could you have been upending? could they have been upending?

Interro-negative form

Simple form	V-ing form
couldn't I upend? couldn't you upend? couldn't he upend? couldn't we upend? couldn't you upend? couldn't they upend?	couldn't I be upending? couldn't you be upending? couldn't he be upending? couldn't we be upending? couldn't you be upending? couldn't they be upending?
Perfect	V-ing perfect
couldn't I have upended? couldn't you have upended? couldn't he have upended? couldn't we have upended? couldn't you have upended? couldn't they have upended?	couldn't I have been upending? couldn't you have been upending? couldn't he have been upending? couldn't we have been upending? couldn't you have been upending? couldn't they have been upending?