could sprint
Regular verb: sprint - sprinted- sprinted

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could sprint
you could sprint
she could sprint
we could sprint
you could sprint
they could sprint 	I could be sprinting
you could be sprinting
she could be sprinting
we could be sprinting
you could be sprinting
they could be sprinting	I could have sprinted
you could have sprinted
she 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
she 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
she 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
she 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
she 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
she 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 she sprint?
could we sprint?
could you sprint?
could they sprint? 	could I be sprinting?
could you be sprinting?
could she be sprinting?
could we be sprinting?
could you be sprinting?
could they be sprinting? 	could I have sprinted?
could you have sprinted?
could she 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 she 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 she 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 she 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 she 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 she have been sprinting?
couldn't we have been sprinting?
couldn't you have been sprinting?
couldn't they have been sprinting?