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 could not upend you could not upend he could not upend we could not upend you could not upend they could not upend	I could not be upending you could not be upending he could not be upending we could not be upending you could not be upending they could not be upending
Perfect	V-ing perfect
I could not have upended you could not have upended he could not have upended we could not have upended you could not have upended they could not have upended	I could not have been upending you could not have been upending he could not have been upending we could not have been upending you could not have been upending they could not 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
could I not upend? could you not upend? could he not upend? could we not upend? could you not upend? could they not upend?	could I not be upending? could you not be upending? could he not be upending? could we not be upending? could you not be upending? could they not be upending?
Perfect	V-ing perfect
could I not have upended? could you not have upended? could he not have upended? could we not have upended? could you not have upended? could they not have upended?	could I not have been upending? could you not have been upending? could he not have been upending? could we not have been upending? could you not have been upending? could they not have been upending?