I must wither you must wither he must wither we must wither you must wither they must wither
Forma con V-ing
I must be withering you must be withering he must be withering we must be withering you must be withering they must be withering
Perfecto
I must have withered you must have withered he must have withered we must have withered you must have withered they must have withered
Perfecto con V-ing
I must have been withering you must have been withering he must have been withering we must have been withering you must have been withering they must have been withering
Negación
Forma simple
I must not wither you must not wither he must not wither we must not wither you must not wither they must not wither
Forma con V-ing
I must not be withering you must not be withering he must not be withering we must not be withering you must not be withering they must not be withering
Perfecto
I must not have withered you must not have withered he must not have withered we must not have withered you must not have withered they must not have withered
Perfecto con V-ing
I must not have been withering you must not have been withering he must not have been withering we must not have been withering you must not have been withering they must not have been withering
Forma interrogativa
Forma simple
must I wither? must you wither? must he wither? must we wither? must you wither? must they wither?
Forma con V-ing
must I be withering? must you be withering? must he be withering? must we be withering? must you be withering? must they be withering?
Perfecto
must I have withered? must you have withered? must he have withered? must we have withered? must you have withered? must they have withered?
Perfecto con V-ing
must I have been withering? must you have been withering? must he have been withering? must we have been withering? must you have been withering? must they have been withering?
Forma interro-negativa
Forma simple
must I not wither? must you not wither? must he not wither? must we not wither? must you not wither? must they not wither?
Forma con V-ing
must I not be withering? must you not be withering? must he not be withering? must we not be withering? must you not be withering? must they not be withering?
Perfecto
must I not have withered? must you not have withered? must he not have withered? must we not have withered? must you not have withered? must they not have withered?
Perfecto con V-ing
must I not have been withering? must you not have been withering? must he not have been withering? must we not have been withering? must you not have been withering? must they not have been withering?