I must maintain you must maintain he must maintain we must maintain you must maintain they must maintain
Forma con V-ing
I must be maintaining you must be maintaining he must be maintaining we must be maintaining you must be maintaining they must be maintaining
Perfecto
I must have maintained you must have maintained he must have maintained we must have maintained you must have maintained they must have maintained
Perfecto con V-ing
I must have been maintaining you must have been maintaining he must have been maintaining we must have been maintaining you must have been maintaining they must have been maintaining
Negación
Forma simple
I must not maintain you must not maintain he must not maintain we must not maintain you must not maintain they must not maintain
Forma con V-ing
I must not be maintaining you must not be maintaining he must not be maintaining we must not be maintaining you must not be maintaining they must not be maintaining
Perfecto
I must not have maintained you must not have maintained he must not have maintained we must not have maintained you must not have maintained they must not have maintained
Perfecto con V-ing
I must not have been maintaining you must not have been maintaining he must not have been maintaining we must not have been maintaining you must not have been maintaining they must not have been maintaining
Forma interrogativa
Forma simple
must I maintain? must you maintain? must he maintain? must we maintain? must you maintain? must they maintain?
Forma con V-ing
must I be maintaining? must you be maintaining? must he be maintaining? must we be maintaining? must you be maintaining? must they be maintaining?
Perfecto
must I have maintained? must you have maintained? must he have maintained? must we have maintained? must you have maintained? must they have maintained?
Perfecto con V-ing
must I have been maintaining? must you have been maintaining? must he have been maintaining? must we have been maintaining? must you have been maintaining? must they have been maintaining?
Forma interro-negativa
Forma simple
must I not maintain? must you not maintain? must he not maintain? must we not maintain? must you not maintain? must they not maintain?
Forma con V-ing
must I not be maintaining? must you not be maintaining? must he not be maintaining? must we not be maintaining? must you not be maintaining? must they not be maintaining?
Perfecto
must I not have maintained? must you not have maintained? must he not have maintained? must we not have maintained? must you not have maintained? must they not have maintained?
Perfecto con V-ing
must I not have been maintaining? must you not have been maintaining? must he not have been maintaining? must we not have been maintaining? must you not have been maintaining? must they not have been maintaining?