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 must not crumble you must not crumble he must not crumble we must not crumble you must not crumble they must not crumble
Forme en V-ing
I must not be crumbling you must not be crumbling he must not be crumbling we must not be crumbling you must not be crumbling they must not be crumbling
Perfect
I must not have crumbled you must not have crumbled he must not have crumbled we must not have crumbled you must not have crumbled they must not have crumbled
Perfect en V-ing
I must not have been crumbling you must not have been crumbling he must not have been crumbling we must not have been crumbling you must not have been crumbling they must not 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
must I not crumble? must you not crumble? must he not crumble? must we not crumble? must you not crumble? must they not crumble?
Forme en V-ing
must I not be crumbling? must you not be crumbling? must he not be crumbling? must we not be crumbling? must you not be crumbling? must they not be crumbling?
Perfect
must I not have crumbled? must you not have crumbled? must he not have crumbled? must we not have crumbled? must you not have crumbled? must they not have crumbled?
Perfect en V-ing
must I not have been crumbling? must you not have been crumbling? must he not have been crumbling? must we not have been crumbling? must you not have been crumbling? must they not have been crumbling?