could double
Verbo regular: double - doubled- doubled

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could double
you could double
he could double
we could double
you could double
they could double 	I could be doubling
you could be doubling
he could be doubling
we could be doubling
you could be doubling
they could be doubling	I could have doubled
you could have doubled
he could have doubled
we could have doubled
you could have doubled
they could have doubled	I could have been doubling
you could have been doubling
he could have been doubling
we could have been doubling
you could have been doubling
they could have been doubling	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could not double
you could not double
he could not double
we could not double
you could not double
they could not double 	I could not be doubling
you could not be doubling
he could not be doubling
we could not be doubling
you could not be doubling
they could not be doubling	I could not have doubled
you could not have doubled
he could not have doubled
we could not have doubled
you could not have doubled
they could not have doubled	I could not have been doubling
you could not have been doubling
he could not have been doubling
we could not have been doubling
you could not have been doubling
they could not have been doubling	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I double?
could you double?
could he double?
could we double?
could you double?
could they double? 	could I be doubling?
could you be doubling?
could he be doubling?
could we be doubling?
could you be doubling?
could they be doubling? 	could I have doubled?
could you have doubled?
could he have doubled?
could we have doubled?
could you have doubled?
could they have doubled? 	could I have been doubling?
could you have been doubling?
could he have been doubling?
could we have been doubling?
could you have been doubling?
could they have been doubling? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I not double?
could you not double?
could he not double?
could we not double?
could you not double?
could they not double? 	could I not be doubling?
could you not be doubling?
could he not be doubling?
could we not be doubling?
could you not be doubling?
could they not be doubling? 	could I not have doubled?
could you not have doubled?
could he not have doubled?
could we not have doubled?
could you not have doubled?
could they not have doubled? 	could I not have been doubling?
could you not have been doubling?
could he not have been doubling?
could we not have been doubling?
could you not have been doubling?
could they not have been doubling?