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
he must derai
we must derai
you must derai
they must derai 	I must be deraiing
you must be deraiing
he must be deraiing
we must be deraiing
you must be deraiing
they must be deraiing	I must have deraied
you must have deraied
he 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
he 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 must not derai
you must not derai
he must not derai
we must not derai
you must not derai
they must not derai 	I must not be deraiing
you must not be deraiing
he must not be deraiing
we must not be deraiing
you must not be deraiing
they must not be deraiing	I must not have deraied
you must not have deraied
he must not have deraied
we must not have deraied
you must not have deraied
they must not have deraied	I must not have been deraiing
you must not have been deraiing
he must not have been deraiing
we must not have been deraiing
you must not have been deraiing
they must not have been deraiing	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I derai?
must you derai?
must he derai?
must we derai?
must you derai?
must they derai? 	must I be deraiing?
must you be deraiing?
must he be deraiing?
must we be deraiing?
must you be deraiing?
must they be deraiing? 	must I have deraied?
must you have deraied?
must he 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 he 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 	
must I not derai?
must you not derai?
must he not derai?
must we not derai?
must you not derai?
must they not derai? 	must I not be deraiing?
must you not be deraiing?
must he not be deraiing?
must we not be deraiing?
must you not be deraiing?
must they not be deraiing? 	must I not have deraied?
must you not have deraied?
must he not have deraied?
must we not have deraied?
must you not have deraied?
must they not have deraied? 	must I not have been deraiing?
must you not have been deraiing?
must he not have been deraiing?
must we not have been deraiing?
must you not have been deraiing?
must they not have been deraiing?