must ail
Verbo regular: ail - ailed- ailed

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must ail
you must ail
he must ail
we must ail
you must ail
they must ail 	I must be ailing
you must be ailing
he must be ailing
we must be ailing
you must be ailing
they must be ailing	I must have ailed
you must have ailed
he must have ailed
we must have ailed
you must have ailed
they must have ailed	I must have been ailing
you must have been ailing
he must have been ailing
we must have been ailing
you must have been ailing
they must have been ailing	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I mustn't ail
you mustn't ail
he mustn't ail
we mustn't ail
you mustn't ail
they mustn't ail 	I mustn't be ailing
you mustn't be ailing
he mustn't be ailing
we mustn't be ailing
you mustn't be ailing
they mustn't be ailing	I mustn't have ailed
you mustn't have ailed
he mustn't have ailed
we mustn't have ailed
you mustn't have ailed
they mustn't have ailed	I mustn't have been ailing
you mustn't have been ailing
he mustn't have been ailing
we mustn't have been ailing
you mustn't have been ailing
they mustn't have been ailing	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I ail?
must you ail?
must he ail?
must we ail?
must you ail?
must they ail? 	must I be ailing?
must you be ailing?
must he be ailing?
must we be ailing?
must you be ailing?
must they be ailing? 	must I have ailed?
must you have ailed?
must he have ailed?
must we have ailed?
must you have ailed?
must they have ailed? 	must I have been ailing?
must you have been ailing?
must he have been ailing?
must we have been ailing?
must you have been ailing?
must they have been ailing? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
mustn't I ail?
mustn't you ail?
mustn't he ail?
mustn't we ail?
mustn't you ail?
mustn't they ail? 	mustn't I be ailing?
mustn't you be ailing?
mustn't he be ailing?
mustn't we be ailing?
mustn't you be ailing?
mustn't they be ailing? 	mustn't I have ailed?
mustn't you have ailed?
mustn't he have ailed?
mustn't we have ailed?
mustn't you have ailed?
mustn't they have ailed? 	mustn't I have been ailing?
mustn't you have been ailing?
mustn't he have been ailing?
mustn't we have been ailing?
mustn't you have been ailing?
mustn't they have been ailing?