I must explain you must explain he must explain we must explain you must explain they must explain
Forma con V-ing
I must be explaining you must be explaining he must be explaining we must be explaining you must be explaining they must be explaining
Perfecto
I must have explained you must have explained he must have explained we must have explained you must have explained they must have explained
Perfecto con V-ing
I must have been explaining you must have been explaining he must have been explaining we must have been explaining you must have been explaining they must have been explaining
Negación
Forma simple
I mustn't explain you mustn't explain he mustn't explain we mustn't explain you mustn't explain they mustn't explain
Forma con V-ing
I mustn't be explaining you mustn't be explaining he mustn't be explaining we mustn't be explaining you mustn't be explaining they mustn't be explaining
Perfecto
I mustn't have explained you mustn't have explained he mustn't have explained we mustn't have explained you mustn't have explained they mustn't have explained
Perfecto con V-ing
I mustn't have been explaining you mustn't have been explaining he mustn't have been explaining we mustn't have been explaining you mustn't have been explaining they mustn't have been explaining
Forma interrogativa
Forma simple
must I explain? must you explain? must he explain? must we explain? must you explain? must they explain?
Forma con V-ing
must I be explaining? must you be explaining? must he be explaining? must we be explaining? must you be explaining? must they be explaining?
Perfecto
must I have explained? must you have explained? must he have explained? must we have explained? must you have explained? must they have explained?
Perfecto con V-ing
must I have been explaining? must you have been explaining? must he have been explaining? must we have been explaining? must you have been explaining? must they have been explaining?
Forma interro-negativa
Forma simple
mustn't I explain? mustn't you explain? mustn't he explain? mustn't we explain? mustn't you explain? mustn't they explain?
Forma con V-ing
mustn't I be explaining? mustn't you be explaining? mustn't he be explaining? mustn't we be explaining? mustn't you be explaining? mustn't they be explaining?
Perfecto
mustn't I have explained? mustn't you have explained? mustn't he have explained? mustn't we have explained? mustn't you have explained? mustn't they have explained?
Perfecto con V-ing
mustn't I have been explaining? mustn't you have been explaining? mustn't he have been explaining? mustn't we have been explaining? mustn't you have been explaining? mustn't they have been explaining?