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