English verb conjugation
MUST MAINTAIN

Regular verb: maintain - maintained - maintained

Affirmation

Simple form	V-ing form
I must maintain you must maintain she must maintain we must maintain you must maintain they must maintain	I must be maintaining you must be maintaining she must be maintaining we must be maintaining you must be maintaining they must be maintaining
Perfect	V-ing perfect
I must have maintained you must have maintained she must have maintained we must have maintained you must have maintained they must have maintained	I must have been maintaining you must have been maintaining she must have been maintaining we must have been maintaining you must have been maintaining they must have been maintaining

Negation

Simple form	V-ing form
I must not maintain you must not maintain she must not maintain we must not maintain you must not maintain they must not maintain	I must not be maintaining you must not be maintaining she must not be maintaining we must not be maintaining you must not be maintaining they must not be maintaining
Perfect	V-ing perfect
I must not have maintained you must not have maintained she must not have maintained we must not have maintained you must not have maintained they must not have maintained	I must not have been maintaining you must not have been maintaining she must not have been maintaining we must not have been maintaining you must not have been maintaining they must not have been maintaining

Interrogative form

Simple form	V-ing form
must I maintain? must you maintain? must she maintain? must we maintain? must you maintain? must they maintain?	must I be maintaining? must you be maintaining? must she be maintaining? must we be maintaining? must you be maintaining? must they be maintaining?
Perfect	V-ing perfect
must I have maintained? must you have maintained? must she have maintained? must we have maintained? must you have maintained? must they have maintained?	must I have been maintaining? must you have been maintaining? must she have been maintaining? must we have been maintaining? must you have been maintaining? must they have been maintaining?

Interro-negative form

Simple form	V-ing form
must I not maintain? must you not maintain? must she not maintain? must we not maintain? must you not maintain? must they not maintain?	must I not be maintaining? must you not be maintaining? must she not be maintaining? must we not be maintaining? must you not be maintaining? must they not be maintaining?
Perfect	V-ing perfect
must I not have maintained? must you not have maintained? must she not have maintained? must we not have maintained? must you not have maintained? must they not have maintained?	must I not have been maintaining? must you not have been maintaining? must she not have been maintaining? must we not have been maintaining? must you not have been maintaining? must they not have been maintaining?