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