could tango
Verbo regular: tango - tangoed- tangoed

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could tango
you could tango
he could tango
we could tango
you could tango
they could tango 	I could be tangoing
you could be tangoing
he could be tangoing
we could be tangoing
you could be tangoing
they could be tangoing	I could have tangoed
you could have tangoed
he could have tangoed
we could have tangoed
you could have tangoed
they could have tangoed	I could have been tangoing
you could have been tangoing
he could have been tangoing
we could have been tangoing
you could have been tangoing
they could have been tangoing	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could not tango
you could not tango
he could not tango
we could not tango
you could not tango
they could not tango 	I could not be tangoing
you could not be tangoing
he could not be tangoing
we could not be tangoing
you could not be tangoing
they could not be tangoing	I could not have tangoed
you could not have tangoed
he could not have tangoed
we could not have tangoed
you could not have tangoed
they could not have tangoed	I could not have been tangoing
you could not have been tangoing
he could not have been tangoing
we could not have been tangoing
you could not have been tangoing
they could not have been tangoing	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I tango?
could you tango?
could he tango?
could we tango?
could you tango?
could they tango? 	could I be tangoing?
could you be tangoing?
could he be tangoing?
could we be tangoing?
could you be tangoing?
could they be tangoing? 	could I have tangoed?
could you have tangoed?
could he have tangoed?
could we have tangoed?
could you have tangoed?
could they have tangoed? 	could I have been tangoing?
could you have been tangoing?
could he have been tangoing?
could we have been tangoing?
could you have been tangoing?
could they have been tangoing? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I not tango?
could you not tango?
could he not tango?
could we not tango?
could you not tango?
could they not tango? 	could I not be tangoing?
could you not be tangoing?
could he not be tangoing?
could we not be tangoing?
could you not be tangoing?
could they not be tangoing? 	could I not have tangoed?
could you not have tangoed?
could he not have tangoed?
could we not have tangoed?
could you not have tangoed?
could they not have tangoed? 	could I not have been tangoing?
could you not have been tangoing?
could he not have been tangoing?
could we not have been tangoing?
could you not have been tangoing?
could they not have been tangoing?