I must crumble you must crumble he must crumble we must crumble you must crumble they must crumble
Forme en 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
Perfect
I must have crumbled you must have crumbled he must have crumbled we must have crumbled you must have crumbled they must have crumbled
Perfect en 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
Négation
Forme 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
Forme en 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
Perfect
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
Perfect en 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
Forme interrogative
Forme simple
must I crumble? must you crumble? must he crumble? must we crumble? must you crumble? must they crumble?
Forme en 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?
Perfect
must I have crumbled? must you have crumbled? must he have crumbled? must we have crumbled? must you have crumbled? must they have crumbled?
Perfect en 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?
Forme interro-négative
Forme 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?
Forme en 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?
Perfect
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?
Perfect en 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?