could sprain
Regular verb: sprain - sprained- sprained

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could sprain
you could sprain
she could sprain
we could sprain
you could sprain
they could sprain 	I could be spraining
you could be spraining
she could be spraining
we could be spraining
you could be spraining
they could be spraining	I could have sprained
you could have sprained
she could have sprained
we could have sprained
you could have sprained
they could have sprained	I could have been spraining
you could have been spraining
she could have been spraining
we could have been spraining
you could have been spraining
they could have been spraining	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not sprain
you could not sprain
she could not sprain
we could not sprain
you could not sprain
they could not sprain 	I could not be spraining
you could not be spraining
she could not be spraining
we could not be spraining
you could not be spraining
they could not be spraining	I could not have sprained
you could not have sprained
she could not have sprained
we could not have sprained
you could not have sprained
they could not have sprained	I could not have been spraining
you could not have been spraining
she could not have been spraining
we could not have been spraining
you could not have been spraining
they could not have been spraining	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I sprain?
could you sprain?
could she sprain?
could we sprain?
could you sprain?
could they sprain? 	could I be spraining?
could you be spraining?
could she be spraining?
could we be spraining?
could you be spraining?
could they be spraining? 	could I have sprained?
could you have sprained?
could she have sprained?
could we have sprained?
could you have sprained?
could they have sprained? 	could I have been spraining?
could you have been spraining?
could she have been spraining?
could we have been spraining?
could you have been spraining?
could they have been spraining? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not sprain?
could you not sprain?
could she not sprain?
could we not sprain?
could you not sprain?
could they not sprain? 	could I not be spraining?
could you not be spraining?
could she not be spraining?
could we not be spraining?
could you not be spraining?
could they not be spraining? 	could I not have sprained?
could you not have sprained?
could she not have sprained?
could we not have sprained?
could you not have sprained?
could they not have sprained? 	could I not have been spraining?
could you not have been spraining?
could she not have been spraining?
could we not have been spraining?
could you not have been spraining?
could they not have been spraining?