must flail
Verbe régulier : flail - flailed- flailed
Traduction française : battre au fléau - s'agiter violemment 

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must flail
you must flail
he must flail
we must flail
you must flail
they must flail 	I must be flailing
you must be flailing
he must be flailing
we must be flailing
you must be flailing
they must be flailing	I must have flailed
you must have flailed
he must have flailed
we must have flailed
you must have flailed
they must have flailed	I must have been flailing
you must have been flailing
he must have been flailing
we must have been flailing
you must have been flailing
they must have been flailing	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must not flail
you must not flail
he must not flail
we must not flail
you must not flail
they must not flail 	I must not be flailing
you must not be flailing
he must not be flailing
we must not be flailing
you must not be flailing
they must not be flailing	I must not have flailed
you must not have flailed
he must not have flailed
we must not have flailed
you must not have flailed
they must not have flailed	I must not have been flailing
you must not have been flailing
he must not have been flailing
we must not have been flailing
you must not have been flailing
they must not have been flailing	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I flail?
must you flail?
must he flail?
must we flail?
must you flail?
must they flail? 	must I be flailing?
must you be flailing?
must he be flailing?
must we be flailing?
must you be flailing?
must they be flailing? 	must I have flailed?
must you have flailed?
must he have flailed?
must we have flailed?
must you have flailed?
must they have flailed? 	must I have been flailing?
must you have been flailing?
must he have been flailing?
must we have been flailing?
must you have been flailing?
must they have been flailing? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I not flail?
must you not flail?
must he not flail?
must we not flail?
must you not flail?
must they not flail? 	must I not be flailing?
must you not be flailing?
must he not be flailing?
must we not be flailing?
must you not be flailing?
must they not be flailing? 	must I not have flailed?
must you not have flailed?
must he not have flailed?
must we not have flailed?
must you not have flailed?
must they not have flailed? 	must I not have been flailing?
must you not have been flailing?
must he not have been flailing?
must we not have been flailing?
must you not have been flailing?
must they not have been flailing?