English verb conjugation
COULD UPSPRING

Irregular verb: upspring - upsprang, upsprung - upsprung

Affirmation

Simple form	V-ing form
I could upspring you could upspring he could upspring we could upspring you could upspring they could upspring	I could be upspringing you could be upspringing he could be upspringing we could be upspringing you could be upspringing they could be upspringing
Perfect	V-ing perfect
I could have upsprung you could have upsprung he could have upsprung we could have upsprung you could have upsprung they could have upsprung	I could have been upspringing you could have been upspringing he could have been upspringing we could have been upspringing you could have been upspringing they could have been upspringing

Negation

Simple form	V-ing form
I could not upspring you could not upspring he could not upspring we could not upspring you could not upspring they could not upspring	I could not be upspringing you could not be upspringing he could not be upspringing we could not be upspringing you could not be upspringing they could not be upspringing
Perfect	V-ing perfect
I could not have upsprung you could not have upsprung he could not have upsprung we could not have upsprung you could not have upsprung they could not have upsprung	I could not have been upspringing you could not have been upspringing he could not have been upspringing we could not have been upspringing you could not have been upspringing they could not have been upspringing

Interrogative form

Simple form	V-ing form
could I upspring? could you upspring? could he upspring? could we upspring? could you upspring? could they upspring?	could I be upspringing? could you be upspringing? could he be upspringing? could we be upspringing? could you be upspringing? could they be upspringing?
Perfect	V-ing perfect
could I have upsprung? could you have upsprung? could he have upsprung? could we have upsprung? could you have upsprung? could they have upsprung?	could I have been upspringing? could you have been upspringing? could he have been upspringing? could we have been upspringing? could you have been upspringing? could they have been upspringing?

Interro-negative form

Simple form	V-ing form
could I not upspring? could you not upspring? could he not upspring? could we not upspring? could you not upspring? could they not upspring?	could I not be upspringing? could you not be upspringing? could he not be upspringing? could we not be upspringing? could you not be upspringing? could they not be upspringing?
Perfect	V-ing perfect
could I not have upsprung? could you not have upsprung? could he not have upsprung? could we not have upsprung? could you not have upsprung? could they not have upsprung?	could I not have been upspringing? could you not have been upspringing? could he not have been upspringing? could we not have been upspringing? could you not have been upspringing? could they not have been upspringing?