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 couldn't upspring you couldn't upspring he couldn't upspring we couldn't upspring you couldn't upspring they couldn't upspring	I couldn't be upspringing you couldn't be upspringing he couldn't be upspringing we couldn't be upspringing you couldn't be upspringing they couldn't be upspringing
Perfect	V-ing perfect
I couldn't have upsprung you couldn't have upsprung he couldn't have upsprung we couldn't have upsprung you couldn't have upsprung they couldn't have upsprung	I couldn't have been upspringing you couldn't have been upspringing he couldn't have been upspringing we couldn't have been upspringing you couldn't have been upspringing they couldn't 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
couldn't I upspring? couldn't you upspring? couldn't he upspring? couldn't we upspring? couldn't you upspring? couldn't they upspring?	couldn't I be upspringing? couldn't you be upspringing? couldn't he be upspringing? couldn't we be upspringing? couldn't you be upspringing? couldn't they be upspringing?
Perfect	V-ing perfect
couldn't I have upsprung? couldn't you have upsprung? couldn't he have upsprung? couldn't we have upsprung? couldn't you have upsprung? couldn't they have upsprung?	couldn't I have been upspringing? couldn't you have been upspringing? couldn't he have been upspringing? couldn't we have been upspringing? couldn't you have been upspringing? couldn't they have been upspringing?