could sprint
Regular verb: sprint - sprinted- sprinted

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could sprint
you could sprint
he could sprint
we could sprint
you could sprint
they could sprint 	I could be sprinting
you could be sprinting
he could be sprinting
we could be sprinting
you could be sprinting
they could be sprinting	I could have sprinted
you could have sprinted
he could have sprinted
we could have sprinted
you could have sprinted
they could have sprinted	I could have been sprinting
you could have been sprinting
he could have been sprinting
we could have been sprinting
you could have been sprinting
they could have been sprinting	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't sprint
you couldn't sprint
he couldn't sprint
we couldn't sprint
you couldn't sprint
they couldn't sprint 	I couldn't be sprinting
you couldn't be sprinting
he couldn't be sprinting
we couldn't be sprinting
you couldn't be sprinting
they couldn't be sprinting	I couldn't have sprinted
you couldn't have sprinted
he couldn't have sprinted
we couldn't have sprinted
you couldn't have sprinted
they couldn't have sprinted	I couldn't have been sprinting
you couldn't have been sprinting
he couldn't have been sprinting
we couldn't have been sprinting
you couldn't have been sprinting
they couldn't have been sprinting	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I sprint?
could you sprint?
could he sprint?
could we sprint?
could you sprint?
could they sprint? 	could I be sprinting?
could you be sprinting?
could he be sprinting?
could we be sprinting?
could you be sprinting?
could they be sprinting? 	could I have sprinted?
could you have sprinted?
could he have sprinted?
could we have sprinted?
could you have sprinted?
could they have sprinted? 	could I have been sprinting?
could you have been sprinting?
could he have been sprinting?
could we have been sprinting?
could you have been sprinting?
could they have been sprinting? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I sprint?
couldn't you sprint?
couldn't he sprint?
couldn't we sprint?
couldn't you sprint?
couldn't they sprint? 	couldn't I be sprinting?
couldn't you be sprinting?
couldn't he be sprinting?
couldn't we be sprinting?
couldn't you be sprinting?
couldn't they be sprinting? 	couldn't I have sprinted?
couldn't you have sprinted?
couldn't he have sprinted?
couldn't we have sprinted?
couldn't you have sprinted?
couldn't they have sprinted? 	couldn't I have been sprinting?
couldn't you have been sprinting?
couldn't he have been sprinting?
couldn't we have been sprinting?
couldn't you have been sprinting?
couldn't they have been sprinting?