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 must not obscure
you must not obscure
she must not obscure
we must not obscure
you must not obscure
they must not obscure 	I must not be obscuring
you must not be obscuring
she must not be obscuring
we must not be obscuring
you must not be obscuring
they must not be obscuring	I must not have obscured
you must not have obscured
she must not have obscured
we must not have obscured
you must not have obscured
they must not have obscured	I must not have been obscuring
you must not have been obscuring
she must not have been obscuring
we must not have been obscuring
you must not have been obscuring
they must not 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 	
must I not obscure?
must you not obscure?
must she not obscure?
must we not obscure?
must you not obscure?
must they not obscure? 	must I not be obscuring?
must you not be obscuring?
must she not be obscuring?
must we not be obscuring?
must you not be obscuring?
must they not be obscuring? 	must I not have obscured?
must you not have obscured?
must she not have obscured?
must we not have obscured?
must you not have obscured?
must they not have obscured? 	must I not have been obscuring?
must you not have been obscuring?
must she not have been obscuring?
must we not have been obscuring?
must you not have been obscuring?
must they not have been obscuring?