I must while you must while he must while we must while you must while they must while
Forma con V-ing
I must be whiling you must be whiling he must be whiling we must be whiling you must be whiling they must be whiling
Perfecto
I must have whiled you must have whiled he must have whiled we must have whiled you must have whiled they must have whiled
Perfecto con V-ing
I must have been whiling you must have been whiling he must have been whiling we must have been whiling you must have been whiling they must have been whiling
Negación
Forma simple
I must not while you must not while he must not while we must not while you must not while they must not while
Forma con V-ing
I must not be whiling you must not be whiling he must not be whiling we must not be whiling you must not be whiling they must not be whiling
Perfecto
I must not have whiled you must not have whiled he must not have whiled we must not have whiled you must not have whiled they must not have whiled
Perfecto con V-ing
I must not have been whiling you must not have been whiling he must not have been whiling we must not have been whiling you must not have been whiling they must not have been whiling
Forma interrogativa
Forma simple
must I while? must you while? must he while? must we while? must you while? must they while?
Forma con V-ing
must I be whiling? must you be whiling? must he be whiling? must we be whiling? must you be whiling? must they be whiling?
Perfecto
must I have whiled? must you have whiled? must he have whiled? must we have whiled? must you have whiled? must they have whiled?
Perfecto con V-ing
must I have been whiling? must you have been whiling? must he have been whiling? must we have been whiling? must you have been whiling? must they have been whiling?
Forma interro-negativa
Forma simple
must I not while? must you not while? must he not while? must we not while? must you not while? must they not while?
Forma con V-ing
must I not be whiling? must you not be whiling? must he not be whiling? must we not be whiling? must you not be whiling? must they not be whiling?
Perfecto
must I not have whiled? must you not have whiled? must he not have whiled? must we not have whiled? must you not have whiled? must they not have whiled?
Perfecto con V-ing
must I not have been whiling? must you not have been whiling? must he not have been whiling? must we not have been whiling? must you not have been whiling? must they not have been whiling?