must vail
Verbo regular: vail - vailed- vailed

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must vail
you must vail
he must vail
we must vail
you must vail
they must vail 	I must be vailing
you must be vailing
he must be vailing
we must be vailing
you must be vailing
they must be vailing	I must have vailed
you must have vailed
he must have vailed
we must have vailed
you must have vailed
they must have vailed	I must have been vailing
you must have been vailing
he must have been vailing
we must have been vailing
you must have been vailing
they must have been vailing	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I mustn't vail
you mustn't vail
he mustn't vail
we mustn't vail
you mustn't vail
they mustn't vail 	I mustn't be vailing
you mustn't be vailing
he mustn't be vailing
we mustn't be vailing
you mustn't be vailing
they mustn't be vailing	I mustn't have vailed
you mustn't have vailed
he mustn't have vailed
we mustn't have vailed
you mustn't have vailed
they mustn't have vailed	I mustn't have been vailing
you mustn't have been vailing
he mustn't have been vailing
we mustn't have been vailing
you mustn't have been vailing
they mustn't have been vailing	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I vail?
must you vail?
must he vail?
must we vail?
must you vail?
must they vail? 	must I be vailing?
must you be vailing?
must he be vailing?
must we be vailing?
must you be vailing?
must they be vailing? 	must I have vailed?
must you have vailed?
must he have vailed?
must we have vailed?
must you have vailed?
must they have vailed? 	must I have been vailing?
must you have been vailing?
must he have been vailing?
must we have been vailing?
must you have been vailing?
must they have been vailing? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
mustn't I vail?
mustn't you vail?
mustn't he vail?
mustn't we vail?
mustn't you vail?
mustn't they vail? 	mustn't I be vailing?
mustn't you be vailing?
mustn't he be vailing?
mustn't we be vailing?
mustn't you be vailing?
mustn't they be vailing? 	mustn't I have vailed?
mustn't you have vailed?
mustn't he have vailed?
mustn't we have vailed?
mustn't you have vailed?
mustn't they have vailed? 	mustn't I have been vailing?
mustn't you have been vailing?
mustn't he have been vailing?
mustn't we have been vailing?
mustn't you have been vailing?
mustn't they have been vailing?