must undo
Verbe irrégulier : undo - undid- undone
Traduction française : défaire - annuler 

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must undo
you must undo
he must undo
we must undo
you must undo
they must undo 	I must be undoing
you must be undoing
he must be undoing
we must be undoing
you must be undoing
they must be undoing	I must have undone
you must have undone
he must have undone
we must have undone
you must have undone
they must have undone	I must have been undoing
you must have been undoing
he must have been undoing
we must have been undoing
you must have been undoing
they must have been undoing	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I mustn't undo
you mustn't undo
he mustn't undo
we mustn't undo
you mustn't undo
they mustn't undo 	I mustn't be undoing
you mustn't be undoing
he mustn't be undoing
we mustn't be undoing
you mustn't be undoing
they mustn't be undoing	I mustn't have undone
you mustn't have undone
he mustn't have undone
we mustn't have undone
you mustn't have undone
they mustn't have undone	I mustn't have been undoing
you mustn't have been undoing
he mustn't have been undoing
we mustn't have been undoing
you mustn't have been undoing
they mustn't have been undoing	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I undo?
must you undo?
must he undo?
must we undo?
must you undo?
must they undo? 	must I be undoing?
must you be undoing?
must he be undoing?
must we be undoing?
must you be undoing?
must they be undoing? 	must I have undone?
must you have undone?
must he have undone?
must we have undone?
must you have undone?
must they have undone? 	must I have been undoing?
must you have been undoing?
must he have been undoing?
must we have been undoing?
must you have been undoing?
must they have been undoing? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
mustn't I undo?
mustn't you undo?
mustn't he undo?
mustn't we undo?
mustn't you undo?
mustn't they undo? 	mustn't I be undoing?
mustn't you be undoing?
mustn't he be undoing?
mustn't we be undoing?
mustn't you be undoing?
mustn't they be undoing? 	mustn't I have undone?
mustn't you have undone?
mustn't he have undone?
mustn't we have undone?
mustn't you have undone?
mustn't they have undone? 	mustn't I have been undoing?
mustn't you have been undoing?
mustn't he have been undoing?
mustn't we have been undoing?
mustn't you have been undoing?
mustn't they have been undoing?