must obscure
Verbo regular: obscure - obscured- obscured

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must obscure
you must obscure
he must obscure
we must obscure
you must obscure
they must obscure 	I must be obscuring
you must be obscuring
he must be obscuring
we must be obscuring
you must be obscuring
they must be obscuring	I must have obscured
you must have obscured
he must have obscured
we must have obscured
you must have obscured
they must have obscured	I must have been obscuring
you must have been obscuring
he must have been obscuring
we must have been obscuring
you must have been obscuring
they must have been obscuring	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I mustn't obscure
you mustn't obscure
he mustn't obscure
we mustn't obscure
you mustn't obscure
they mustn't obscure 	I mustn't be obscuring
you mustn't be obscuring
he mustn't be obscuring
we mustn't be obscuring
you mustn't be obscuring
they mustn't be obscuring	I mustn't have obscured
you mustn't have obscured
he mustn't have obscured
we mustn't have obscured
you mustn't have obscured
they mustn't have obscured	I mustn't have been obscuring
you mustn't have been obscuring
he mustn't have been obscuring
we mustn't have been obscuring
you mustn't have been obscuring
they mustn't have been obscuring	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I obscure?
must you obscure?
must he obscure?
must we obscure?
must you obscure?
must they obscure? 	must I be obscuring?
must you be obscuring?
must he be obscuring?
must we be obscuring?
must you be obscuring?
must they be obscuring? 	must I have obscured?
must you have obscured?
must he have obscured?
must we have obscured?
must you have obscured?
must they have obscured? 	must I have been obscuring?
must you have been obscuring?
must he have been obscuring?
must we have been obscuring?
must you have been obscuring?
must they have been obscuring? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
mustn't I obscure?
mustn't you obscure?
mustn't he obscure?
mustn't we obscure?
mustn't you obscure?
mustn't they obscure? 	mustn't I be obscuring?
mustn't you be obscuring?
mustn't he be obscuring?
mustn't we be obscuring?
mustn't you be obscuring?
mustn't they be obscuring? 	mustn't I have obscured?
mustn't you have obscured?
mustn't he have obscured?
mustn't we have obscured?
mustn't you have obscured?
mustn't they have obscured? 	mustn't I have been obscuring?
mustn't you have been obscuring?
mustn't he have been obscuring?
mustn't we have been obscuring?
mustn't you have been obscuring?
mustn't they have been obscuring?