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
she must obscure
we must obscure
you must obscure
they must obscure 	I must be obscuring
you must be obscuring
she must be obscuring
we must be obscuring
you must be obscuring
they must be obscuring	I must have obscured
you must have obscured
she 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
she 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
she 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
she 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
she 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
she 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 she obscure?
must we obscure?
must you obscure?
must they obscure? 	must I be obscuring?
must you be obscuring?
must she be obscuring?
must we be obscuring?
must you be obscuring?
must they be obscuring? 	must I have obscured?
must you have obscured?
must she 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 she 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 she 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 she 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 she 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 she have been obscuring?
mustn't we have been obscuring?
mustn't you have been obscuring?
mustn't they have been obscuring?