English verb conjugation
MUST BRAIN

Regular verb: brain - brained - brained

Affirmation

Simple form	V-ing form
I must brain you must brain he must brain we must brain you must brain they must brain	I must be braining you must be braining he must be braining we must be braining you must be braining they must be braining
Perfect	V-ing perfect
I must have brained you must have brained he must have brained we must have brained you must have brained they must have brained	I must have been braining you must have been braining he must have been braining we must have been braining you must have been braining they must have been braining

Negation

Simple form	V-ing form
I mustn't brain you mustn't brain he mustn't brain we mustn't brain you mustn't brain they mustn't brain	I mustn't be braining you mustn't be braining he mustn't be braining we mustn't be braining you mustn't be braining they mustn't be braining
Perfect	V-ing perfect
I mustn't have brained you mustn't have brained he mustn't have brained we mustn't have brained you mustn't have brained they mustn't have brained	I mustn't have been braining you mustn't have been braining he mustn't have been braining we mustn't have been braining you mustn't have been braining they mustn't have been braining

Interrogative form

Simple form	V-ing form
must I brain? must you brain? must he brain? must we brain? must you brain? must they brain?	must I be braining? must you be braining? must he be braining? must we be braining? must you be braining? must they be braining?
Perfect	V-ing perfect
must I have brained? must you have brained? must he have brained? must we have brained? must you have brained? must they have brained?	must I have been braining? must you have been braining? must he have been braining? must we have been braining? must you have been braining? must they have been braining?

Interro-negative form

Simple form	V-ing form
mustn't I brain? mustn't you brain? mustn't he brain? mustn't we brain? mustn't you brain? mustn't they brain?	mustn't I be braining? mustn't you be braining? mustn't he be braining? mustn't we be braining? mustn't you be braining? mustn't they be braining?
Perfect	V-ing perfect
mustn't I have brained? mustn't you have brained? mustn't he have brained? mustn't we have brained? mustn't you have brained? mustn't they have brained?	mustn't I have been braining? mustn't you have been braining? mustn't he have been braining? mustn't we have been braining? mustn't you have been braining? mustn't they have been braining?