I must breathe you must breathe she must breathe we must breathe you must breathe they must breathe
Forma con V-ing
I must be breathing you must be breathing she must be breathing we must be breathing you must be breathing they must be breathing
Perfecto
I must have breathed you must have breathed she must have breathed we must have breathed you must have breathed they must have breathed
Perfecto con V-ing
I must have been breathing you must have been breathing she must have been breathing we must have been breathing you must have been breathing they must have been breathing
Negación
Forma simple
I mustn't breathe you mustn't breathe she mustn't breathe we mustn't breathe you mustn't breathe they mustn't breathe
Forma con V-ing
I mustn't be breathing you mustn't be breathing she mustn't be breathing we mustn't be breathing you mustn't be breathing they mustn't be breathing
Perfecto
I mustn't have breathed you mustn't have breathed she mustn't have breathed we mustn't have breathed you mustn't have breathed they mustn't have breathed
Perfecto con V-ing
I mustn't have been breathing you mustn't have been breathing she mustn't have been breathing we mustn't have been breathing you mustn't have been breathing they mustn't have been breathing
Forma interrogativa
Forma simple
must I breathe? must you breathe? must she breathe? must we breathe? must you breathe? must they breathe?
Forma con V-ing
must I be breathing? must you be breathing? must she be breathing? must we be breathing? must you be breathing? must they be breathing?
Perfecto
must I have breathed? must you have breathed? must she have breathed? must we have breathed? must you have breathed? must they have breathed?
Perfecto con V-ing
must I have been breathing? must you have been breathing? must she have been breathing? must we have been breathing? must you have been breathing? must they have been breathing?
Forma interro-negativa
Forma simple
mustn't I breathe? mustn't you breathe? mustn't she breathe? mustn't we breathe? mustn't you breathe? mustn't they breathe?
Forma con V-ing
mustn't I be breathing? mustn't you be breathing? mustn't she be breathing? mustn't we be breathing? mustn't you be breathing? mustn't they be breathing?
Perfecto
mustn't I have breathed? mustn't you have breathed? mustn't she have breathed? mustn't we have breathed? mustn't you have breathed? mustn't they have breathed?
Perfecto con V-ing
mustn't I have been breathing? mustn't you have been breathing? mustn't she have been breathing? mustn't we have been breathing? mustn't you have been breathing? mustn't they have been breathing?