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 must not brain you must not brain he must not brain we must not brain you must not brain they must not brain	I must not be braining you must not be braining he must not be braining we must not be braining you must not be braining they must not be braining
Perfect	V-ing perfect
I must not have brained you must not have brained he must not have brained we must not have brained you must not have brained they must not have brained	I must not have been braining you must not have been braining he must not have been braining we must not have been braining you must not have been braining they must not 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
must I not brain? must you not brain? must he not brain? must we not brain? must you not brain? must they not brain?	must I not be braining? must you not be braining? must he not be braining? must we not be braining? must you not be braining? must they not be braining?
Perfect	V-ing perfect
must I not have brained? must you not have brained? must he not have brained? must we not have brained? must you not have brained? must they not have brained?	must I not have been braining? must you not have been braining? must he not have been braining? must we not have been braining? must you not have been braining? must they not have been braining?