could sprain
Verbo regular: sprain - sprained- sprained

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could sprain
you could sprain
he could sprain
we could sprain
you could sprain
they could sprain 	I could be spraining
you could be spraining
he could be spraining
we could be spraining
you could be spraining
they could be spraining	I could have sprained
you could have sprained
he 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
he could have been spraining
we could have been spraining
you could have been spraining
they could have been spraining	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I couldn't sprain
you couldn't sprain
he couldn't sprain
we couldn't sprain
you couldn't sprain
they couldn't sprain 	I couldn't be spraining
you couldn't be spraining
he couldn't be spraining
we couldn't be spraining
you couldn't be spraining
they couldn't be spraining	I couldn't have sprained
you couldn't have sprained
he couldn't have sprained
we couldn't have sprained
you couldn't have sprained
they couldn't have sprained	I couldn't have been spraining
you couldn't have been spraining
he couldn't have been spraining
we couldn't have been spraining
you couldn't have been spraining
they couldn't have been spraining	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I sprain?
could you sprain?
could he sprain?
could we sprain?
could you sprain?
could they sprain? 	could I be spraining?
could you be spraining?
could he be spraining?
could we be spraining?
could you be spraining?
could they be spraining? 	could I have sprained?
could you have sprained?
could he 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 he have been spraining?
could we have been spraining?
could you have been spraining?
could they have been spraining? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
couldn't I sprain?
couldn't you sprain?
couldn't he sprain?
couldn't we sprain?
couldn't you sprain?
couldn't they sprain? 	couldn't I be spraining?
couldn't you be spraining?
couldn't he be spraining?
couldn't we be spraining?
couldn't you be spraining?
couldn't they be spraining? 	couldn't I have sprained?
couldn't you have sprained?
couldn't he have sprained?
couldn't we have sprained?
couldn't you have sprained?
couldn't they have sprained? 	couldn't I have been spraining?
couldn't you have been spraining?
couldn't he have been spraining?
couldn't we have been spraining?
couldn't you have been spraining?
couldn't they have been spraining?