English verb conjugation
COULD SPRAIN

Regular verb: sprain - sprained - sprained

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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

Negation

Simple form	V-ing form
I could not sprain you could not sprain he 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 he could not be spraining we could not be spraining you could not be spraining they could not be spraining
Perfect	V-ing perfect
I could not have sprained you could not have sprained he 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 he 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
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?
Perfect	V-ing perfect
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?

Interro-negative form

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