I must mar you must mar he must mar we must mar you must mar they must mar
Forma con V-ing
I must be marring you must be marring he must be marring we must be marring you must be marring they must be marring
Perfecto
I must have marred you must have marred he must have marred we must have marred you must have marred they must have marred
Perfecto con V-ing
I must have been marring you must have been marring he must have been marring we must have been marring you must have been marring they must have been marring
Negación
Forma simple
I must not mar you must not mar he must not mar we must not mar you must not mar they must not mar
Forma con V-ing
I must not be marring you must not be marring he must not be marring we must not be marring you must not be marring they must not be marring
Perfecto
I must not have marred you must not have marred he must not have marred we must not have marred you must not have marred they must not have marred
Perfecto con V-ing
I must not have been marring you must not have been marring he must not have been marring we must not have been marring you must not have been marring they must not have been marring
Forma interrogativa
Forma simple
must I mar? must you mar? must he mar? must we mar? must you mar? must they mar?
Forma con V-ing
must I be marring? must you be marring? must he be marring? must we be marring? must you be marring? must they be marring?
Perfecto
must I have marred? must you have marred? must he have marred? must we have marred? must you have marred? must they have marred?
Perfecto con V-ing
must I have been marring? must you have been marring? must he have been marring? must we have been marring? must you have been marring? must they have been marring?
Forma interro-negativa
Forma simple
must I not mar? must you not mar? must he not mar? must we not mar? must you not mar? must they not mar?
Forma con V-ing
must I not be marring? must you not be marring? must he not be marring? must we not be marring? must you not be marring? must they not be marring?
Perfecto
must I not have marred? must you not have marred? must he not have marred? must we not have marred? must you not have marred? must they not have marred?
Perfecto con V-ing
must I not have been marring? must you not have been marring? must he not have been marring? must we not have been marring? must you not have been marring? must they not have been marring?