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