I must leather you must leather he must leather we must leather you must leather they must leather
Forma con V-ing
I must be leathering you must be leathering he must be leathering we must be leathering you must be leathering they must be leathering
Perfecto
I must have leathered you must have leathered he must have leathered we must have leathered you must have leathered they must have leathered
Perfecto con V-ing
I must have been leathering you must have been leathering he must have been leathering we must have been leathering you must have been leathering they must have been leathering
Negación
Forma simple
I must not leather you must not leather he must not leather we must not leather you must not leather they must not leather
Forma con V-ing
I must not be leathering you must not be leathering he must not be leathering we must not be leathering you must not be leathering they must not be leathering
Perfecto
I must not have leathered you must not have leathered he must not have leathered we must not have leathered you must not have leathered they must not have leathered
Perfecto con V-ing
I must not have been leathering you must not have been leathering he must not have been leathering we must not have been leathering you must not have been leathering they must not have been leathering
Forma interrogativa
Forma simple
must I leather? must you leather? must he leather? must we leather? must you leather? must they leather?
Forma con V-ing
must I be leathering? must you be leathering? must he be leathering? must we be leathering? must you be leathering? must they be leathering?
Perfecto
must I have leathered? must you have leathered? must he have leathered? must we have leathered? must you have leathered? must they have leathered?
Perfecto con V-ing
must I have been leathering? must you have been leathering? must he have been leathering? must we have been leathering? must you have been leathering? must they have been leathering?
Forma interro-negativa
Forma simple
must I not leather? must you not leather? must he not leather? must we not leather? must you not leather? must they not leather?
Forma con V-ing
must I not be leathering? must you not be leathering? must he not be leathering? must we not be leathering? must you not be leathering? must they not be leathering?
Perfecto
must I not have leathered? must you not have leathered? must he not have leathered? must we not have leathered? must you not have leathered? must they not have leathered?
Perfecto con V-ing
must I not have been leathering? must you not have been leathering? must he not have been leathering? must we not have been leathering? must you not have been leathering? must they not have been leathering?