must obtain
Verbo regular: obtain - obtained- obtained

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must obtain
you must obtain
he must obtain
we must obtain
you must obtain
they must obtain 	I must be obtaining
you must be obtaining
he must be obtaining
we must be obtaining
you must be obtaining
they must be obtaining	I must have obtained
you must have obtained
he must have obtained
we must have obtained
you must have obtained
they must have obtained	I must have been obtaining
you must have been obtaining
he must have been obtaining
we must have been obtaining
you must have been obtaining
they must have been obtaining	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must not obtain
you must not obtain
he must not obtain
we must not obtain
you must not obtain
they must not obtain 	I must not be obtaining
you must not be obtaining
he must not be obtaining
we must not be obtaining
you must not be obtaining
they must not be obtaining	I must not have obtained
you must not have obtained
he must not have obtained
we must not have obtained
you must not have obtained
they must not have obtained	I must not have been obtaining
you must not have been obtaining
he must not have been obtaining
we must not have been obtaining
you must not have been obtaining
they must not have been obtaining	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I obtain?
must you obtain?
must he obtain?
must we obtain?
must you obtain?
must they obtain? 	must I be obtaining?
must you be obtaining?
must he be obtaining?
must we be obtaining?
must you be obtaining?
must they be obtaining? 	must I have obtained?
must you have obtained?
must he have obtained?
must we have obtained?
must you have obtained?
must they have obtained? 	must I have been obtaining?
must you have been obtaining?
must he have been obtaining?
must we have been obtaining?
must you have been obtaining?
must they have been obtaining? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I not obtain?
must you not obtain?
must he not obtain?
must we not obtain?
must you not obtain?
must they not obtain? 	must I not be obtaining?
must you not be obtaining?
must he not be obtaining?
must we not be obtaining?
must you not be obtaining?
must they not be obtaining? 	must I not have obtained?
must you not have obtained?
must he not have obtained?
must we not have obtained?
must you not have obtained?
must they not have obtained? 	must I not have been obtaining?
must you not have been obtaining?
must he not have been obtaining?
must we not have been obtaining?
must you not have been obtaining?
must they not have been obtaining?