must sail
Verbo regular: sail - sailed- sailed

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must sail
you must sail
he must sail
we must sail
you must sail
they must sail 	I must be sailing
you must be sailing
he must be sailing
we must be sailing
you must be sailing
they must be sailing	I must have sailed
you must have sailed
he must have sailed
we must have sailed
you must have sailed
they must have sailed	I must have been sailing
you must have been sailing
he must have been sailing
we must have been sailing
you must have been sailing
they must have been sailing	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I mustn't sail
you mustn't sail
he mustn't sail
we mustn't sail
you mustn't sail
they mustn't sail 	I mustn't be sailing
you mustn't be sailing
he mustn't be sailing
we mustn't be sailing
you mustn't be sailing
they mustn't be sailing	I mustn't have sailed
you mustn't have sailed
he mustn't have sailed
we mustn't have sailed
you mustn't have sailed
they mustn't have sailed	I mustn't have been sailing
you mustn't have been sailing
he mustn't have been sailing
we mustn't have been sailing
you mustn't have been sailing
they mustn't have been sailing	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I sail?
must you sail?
must he sail?
must we sail?
must you sail?
must they sail? 	must I be sailing?
must you be sailing?
must he be sailing?
must we be sailing?
must you be sailing?
must they be sailing? 	must I have sailed?
must you have sailed?
must he have sailed?
must we have sailed?
must you have sailed?
must they have sailed? 	must I have been sailing?
must you have been sailing?
must he have been sailing?
must we have been sailing?
must you have been sailing?
must they have been sailing? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
mustn't I sail?
mustn't you sail?
mustn't he sail?
mustn't we sail?
mustn't you sail?
mustn't they sail? 	mustn't I be sailing?
mustn't you be sailing?
mustn't he be sailing?
mustn't we be sailing?
mustn't you be sailing?
mustn't they be sailing? 	mustn't I have sailed?
mustn't you have sailed?
mustn't he have sailed?
mustn't we have sailed?
mustn't you have sailed?
mustn't they have sailed? 	mustn't I have been sailing?
mustn't you have been sailing?
mustn't he have been sailing?
mustn't we have been sailing?
mustn't you have been sailing?
mustn't they have been sailing?