could spring
Irregular verb: spring - sprang, sprung- sprung

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could spring
you could spring
he could spring
we could spring
you could spring
they could spring 	I could be springing
you could be springing
he could be springing
we could be springing
you could be springing
they could be springing	I could have sprung
you could have sprung
he could have sprung
we could have sprung
you could have sprung
they could have sprung	I could have been springing
you could have been springing
he could have been springing
we could have been springing
you could have been springing
they could have been springing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't spring
you couldn't spring
he couldn't spring
we couldn't spring
you couldn't spring
they couldn't spring 	I couldn't be springing
you couldn't be springing
he couldn't be springing
we couldn't be springing
you couldn't be springing
they couldn't be springing	I couldn't have sprung
you couldn't have sprung
he couldn't have sprung
we couldn't have sprung
you couldn't have sprung
they couldn't have sprung	I couldn't have been springing
you couldn't have been springing
he couldn't have been springing
we couldn't have been springing
you couldn't have been springing
they couldn't have been springing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I spring?
could you spring?
could he spring?
could we spring?
could you spring?
could they spring? 	could I be springing?
could you be springing?
could he be springing?
could we be springing?
could you be springing?
could they be springing? 	could I have sprung?
could you have sprung?
could he have sprung?
could we have sprung?
could you have sprung?
could they have sprung? 	could I have been springing?
could you have been springing?
could he have been springing?
could we have been springing?
could you have been springing?
could they have been springing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I spring?
couldn't you spring?
couldn't he spring?
couldn't we spring?
couldn't you spring?
couldn't they spring? 	couldn't I be springing?
couldn't you be springing?
couldn't he be springing?
couldn't we be springing?
couldn't you be springing?
couldn't they be springing? 	couldn't I have sprung?
couldn't you have sprung?
couldn't he have sprung?
couldn't we have sprung?
couldn't you have sprung?
couldn't they have sprung? 	couldn't I have been springing?
couldn't you have been springing?
couldn't he have been springing?
couldn't we have been springing?
couldn't you have been springing?
couldn't they have been springing?