English verb conjugation
MUST SPRAIN

Regular verb: sprain - sprained - sprained

Affirmation

Simple form	V-ing form
I must sprain you must sprain he must sprain we must sprain you must sprain they must sprain	I must be spraining you must be spraining he 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 he 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 he 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 mustn't sprain you mustn't sprain he mustn't sprain we mustn't sprain you mustn't sprain they mustn't sprain	I mustn't be spraining you mustn't be spraining he mustn't be spraining we mustn't be spraining you mustn't be spraining they mustn't be spraining
Perfect	V-ing perfect
I mustn't have sprained you mustn't have sprained he mustn't have sprained we mustn't have sprained you mustn't have sprained they mustn't have sprained	I mustn't have been spraining you mustn't have been spraining he mustn't have been spraining we mustn't have been spraining you mustn't have been spraining they mustn't have been spraining

Interrogative form

Simple form	V-ing form
must I sprain? must you sprain? must he sprain? must we sprain? must you sprain? must they sprain?	must I be spraining? must you be spraining? must he 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 he 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 he 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
mustn't I sprain? mustn't you sprain? mustn't he sprain? mustn't we sprain? mustn't you sprain? mustn't they sprain?	mustn't I be spraining? mustn't you be spraining? mustn't he be spraining? mustn't we be spraining? mustn't you be spraining? mustn't they be spraining?
Perfect	V-ing perfect
mustn't I have sprained? mustn't you have sprained? mustn't he have sprained? mustn't we have sprained? mustn't you have sprained? mustn't they have sprained?	mustn't I have been spraining? mustn't you have been spraining? mustn't he have been spraining? mustn't we have been spraining? mustn't you have been spraining? mustn't they have been spraining?