could obtain
Verbo regular: obtain - obtained- obtained

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could obtain
you could obtain
she could obtain
we could obtain
you could obtain
they could obtain 	I could be obtaining
you could be obtaining
she could be obtaining
we could be obtaining
you could be obtaining
they could be obtaining	I could have obtained
you could have obtained
she could have obtained
we could have obtained
you could have obtained
they could have obtained	I could have been obtaining
you could have been obtaining
she could have been obtaining
we could have been obtaining
you could have been obtaining
they could have been obtaining	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I couldn't obtain
you couldn't obtain
she couldn't obtain
we couldn't obtain
you couldn't obtain
they couldn't obtain 	I couldn't be obtaining
you couldn't be obtaining
she couldn't be obtaining
we couldn't be obtaining
you couldn't be obtaining
they couldn't be obtaining	I couldn't have obtained
you couldn't have obtained
she couldn't have obtained
we couldn't have obtained
you couldn't have obtained
they couldn't have obtained	I couldn't have been obtaining
you couldn't have been obtaining
she couldn't have been obtaining
we couldn't have been obtaining
you couldn't have been obtaining
they couldn't have been obtaining	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I obtain?
could you obtain?
could she obtain?
could we obtain?
could you obtain?
could they obtain? 	could I be obtaining?
could you be obtaining?
could she be obtaining?
could we be obtaining?
could you be obtaining?
could they be obtaining? 	could I have obtained?
could you have obtained?
could she have obtained?
could we have obtained?
could you have obtained?
could they have obtained? 	could I have been obtaining?
could you have been obtaining?
could she have been obtaining?
could we have been obtaining?
could you have been obtaining?
could they have been obtaining? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
couldn't I obtain?
couldn't you obtain?
couldn't she obtain?
couldn't we obtain?
couldn't you obtain?
couldn't they obtain? 	couldn't I be obtaining?
couldn't you be obtaining?
couldn't she be obtaining?
couldn't we be obtaining?
couldn't you be obtaining?
couldn't they be obtaining? 	couldn't I have obtained?
couldn't you have obtained?
couldn't she have obtained?
couldn't we have obtained?
couldn't you have obtained?
couldn't they have obtained? 	couldn't I have been obtaining?
couldn't you have been obtaining?
couldn't she have been obtaining?
couldn't we have been obtaining?
couldn't you have been obtaining?
couldn't they have been obtaining?