must derai
Verbe régulier : derai - deraied- deraied
Traduction française : faire dérailler - dérailler 

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must derai
you must derai
she must derai
we must derai
you must derai
they must derai 	I must be deraiing
you must be deraiing
she must be deraiing
we must be deraiing
you must be deraiing
they must be deraiing	I must have deraied
you must have deraied
she must have deraied
we must have deraied
you must have deraied
they must have deraied	I must have been deraiing
you must have been deraiing
she must have been deraiing
we must have been deraiing
you must have been deraiing
they must have been deraiing	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I mustn't derai
you mustn't derai
she mustn't derai
we mustn't derai
you mustn't derai
they mustn't derai 	I mustn't be deraiing
you mustn't be deraiing
she mustn't be deraiing
we mustn't be deraiing
you mustn't be deraiing
they mustn't be deraiing	I mustn't have deraied
you mustn't have deraied
she mustn't have deraied
we mustn't have deraied
you mustn't have deraied
they mustn't have deraied	I mustn't have been deraiing
you mustn't have been deraiing
she mustn't have been deraiing
we mustn't have been deraiing
you mustn't have been deraiing
they mustn't have been deraiing	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I derai?
must you derai?
must she derai?
must we derai?
must you derai?
must they derai? 	must I be deraiing?
must you be deraiing?
must she be deraiing?
must we be deraiing?
must you be deraiing?
must they be deraiing? 	must I have deraied?
must you have deraied?
must she have deraied?
must we have deraied?
must you have deraied?
must they have deraied? 	must I have been deraiing?
must you have been deraiing?
must she have been deraiing?
must we have been deraiing?
must you have been deraiing?
must they have been deraiing? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
mustn't I derai?
mustn't you derai?
mustn't she derai?
mustn't we derai?
mustn't you derai?
mustn't they derai? 	mustn't I be deraiing?
mustn't you be deraiing?
mustn't she be deraiing?
mustn't we be deraiing?
mustn't you be deraiing?
mustn't they be deraiing? 	mustn't I have deraied?
mustn't you have deraied?
mustn't she have deraied?
mustn't we have deraied?
mustn't you have deraied?
mustn't they have deraied? 	mustn't I have been deraiing?
mustn't you have been deraiing?
mustn't she have been deraiing?
mustn't we have been deraiing?
mustn't you have been deraiing?
mustn't they have been deraiing?