must sigh
Verbo regular: sigh - sighed- sighed

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must sigh
you must sigh
he must sigh
we must sigh
you must sigh
they must sigh 	I must be sighing
you must be sighing
he must be sighing
we must be sighing
you must be sighing
they must be sighing	I must have sighed
you must have sighed
he must have sighed
we must have sighed
you must have sighed
they must have sighed	I must have been sighing
you must have been sighing
he must have been sighing
we must have been sighing
you must have been sighing
they must have been sighing	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I mustn't sigh
you mustn't sigh
he mustn't sigh
we mustn't sigh
you mustn't sigh
they mustn't sigh 	I mustn't be sighing
you mustn't be sighing
he mustn't be sighing
we mustn't be sighing
you mustn't be sighing
they mustn't be sighing	I mustn't have sighed
you mustn't have sighed
he mustn't have sighed
we mustn't have sighed
you mustn't have sighed
they mustn't have sighed	I mustn't have been sighing
you mustn't have been sighing
he mustn't have been sighing
we mustn't have been sighing
you mustn't have been sighing
they mustn't have been sighing	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I sigh?
must you sigh?
must he sigh?
must we sigh?
must you sigh?
must they sigh? 	must I be sighing?
must you be sighing?
must he be sighing?
must we be sighing?
must you be sighing?
must they be sighing? 	must I have sighed?
must you have sighed?
must he have sighed?
must we have sighed?
must you have sighed?
must they have sighed? 	must I have been sighing?
must you have been sighing?
must he have been sighing?
must we have been sighing?
must you have been sighing?
must they have been sighing? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
mustn't I sigh?
mustn't you sigh?
mustn't he sigh?
mustn't we sigh?
mustn't you sigh?
mustn't they sigh? 	mustn't I be sighing?
mustn't you be sighing?
mustn't he be sighing?
mustn't we be sighing?
mustn't you be sighing?
mustn't they be sighing? 	mustn't I have sighed?
mustn't you have sighed?
mustn't he have sighed?
mustn't we have sighed?
mustn't you have sighed?
mustn't they have sighed? 	mustn't I have been sighing?
mustn't you have been sighing?
mustn't he have been sighing?
mustn't we have been sighing?
mustn't you have been sighing?
mustn't they have been sighing?