must crumble
Verbe régulier : crumble - crumbled- crumbled
Traduction française : émietter - s'émietter 

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must crumble
you must crumble
she must crumble
we must crumble
you must crumble
they must crumble 	I must be crumbling
you must be crumbling
she must be crumbling
we must be crumbling
you must be crumbling
they must be crumbling	I must have crumbled
you must have crumbled
she must have crumbled
we must have crumbled
you must have crumbled
they must have crumbled	I must have been crumbling
you must have been crumbling
she must have been crumbling
we must have been crumbling
you must have been crumbling
they must have been crumbling	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I mustn't crumble
you mustn't crumble
she mustn't crumble
we mustn't crumble
you mustn't crumble
they mustn't crumble 	I mustn't be crumbling
you mustn't be crumbling
she mustn't be crumbling
we mustn't be crumbling
you mustn't be crumbling
they mustn't be crumbling	I mustn't have crumbled
you mustn't have crumbled
she mustn't have crumbled
we mustn't have crumbled
you mustn't have crumbled
they mustn't have crumbled	I mustn't have been crumbling
you mustn't have been crumbling
she 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 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I crumble?
must you crumble?
must she crumble?
must we crumble?
must you crumble?
must they crumble? 	must I be crumbling?
must you be crumbling?
must she be crumbling?
must we be crumbling?
must you be crumbling?
must they be crumbling? 	must I have crumbled?
must you have crumbled?
must she have crumbled?
must we have crumbled?
must you have crumbled?
must they have crumbled? 	must I have been crumbling?
must you have been crumbling?
must she have been crumbling?
must we have been crumbling?
must you have been crumbling?
must they have been crumbling? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
mustn't I crumble?
mustn't you crumble?
mustn't she crumble?
mustn't we crumble?
mustn't you crumble?
mustn't they crumble? 	mustn't I be crumbling?
mustn't you be crumbling?
mustn't she be crumbling?
mustn't we be crumbling?
mustn't you be crumbling?
mustn't they be crumbling? 	mustn't I have crumbled?
mustn't you have crumbled?
mustn't she have crumbled?
mustn't we have crumbled?
mustn't you have crumbled?
mustn't they have crumbled? 	mustn't I have been crumbling?
mustn't you have been crumbling?
mustn't she have been crumbling?
mustn't we have been crumbling?
mustn't you have been crumbling?
mustn't they have been crumbling?