English verb conjugation
MUST SPRAIN

Regular verb: sprain - sprained - sprained

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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