could upspring
Irregular verb: upspring - upsprang, upsprung- upsprung

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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? 	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 	Perfect 	V-ing perfect 	
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? 	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?