must quail
Verbe régulier : quail - quailed- quailed
Traduction française : trembler - perdre courage 

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must quail
you must quail
he must quail
we must quail
you must quail
they must quail 	I must be quailing
you must be quailing
he must be quailing
we must be quailing
you must be quailing
they must be quailing	I must have quailed
you must have quailed
he must have quailed
we must have quailed
you must have quailed
they must have quailed	I must have been quailing
you must have been quailing
he must have been quailing
we must have been quailing
you must have been quailing
they must have been quailing	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I mustn't quail
you mustn't quail
he mustn't quail
we mustn't quail
you mustn't quail
they mustn't quail 	I mustn't be quailing
you mustn't be quailing
he mustn't be quailing
we mustn't be quailing
you mustn't be quailing
they mustn't be quailing	I mustn't have quailed
you mustn't have quailed
he mustn't have quailed
we mustn't have quailed
you mustn't have quailed
they mustn't have quailed	I mustn't have been quailing
you mustn't have been quailing
he mustn't have been quailing
we mustn't have been quailing
you mustn't have been quailing
they mustn't have been quailing	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I quail?
must you quail?
must he quail?
must we quail?
must you quail?
must they quail? 	must I be quailing?
must you be quailing?
must he be quailing?
must we be quailing?
must you be quailing?
must they be quailing? 	must I have quailed?
must you have quailed?
must he have quailed?
must we have quailed?
must you have quailed?
must they have quailed? 	must I have been quailing?
must you have been quailing?
must he have been quailing?
must we have been quailing?
must you have been quailing?
must they have been quailing? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
mustn't I quail?
mustn't you quail?
mustn't he quail?
mustn't we quail?
mustn't you quail?
mustn't they quail? 	mustn't I be quailing?
mustn't you be quailing?
mustn't he be quailing?
mustn't we be quailing?
mustn't you be quailing?
mustn't they be quailing? 	mustn't I have quailed?
mustn't you have quailed?
mustn't he have quailed?
mustn't we have quailed?
mustn't you have quailed?
mustn't they have quailed? 	mustn't I have been quailing?
mustn't you have been quailing?
mustn't he have been quailing?
mustn't we have been quailing?
mustn't you have been quailing?
mustn't they have been quailing?