could return
Verbo regular: return - returned- returned

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could return
you could return
she could return
we could return
you could return
they could return 	I could be returning
you could be returning
she could be returning
we could be returning
you could be returning
they could be returning	I could have returned
you could have returned
she could have returned
we could have returned
you could have returned
they could have returned	I could have been returning
you could have been returning
she could have been returning
we could have been returning
you could have been returning
they could have been returning	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could not return
you could not return
she could not return
we could not return
you could not return
they could not return 	I could not be returning
you could not be returning
she could not be returning
we could not be returning
you could not be returning
they could not be returning	I could not have returned
you could not have returned
she could not have returned
we could not have returned
you could not have returned
they could not have returned	I could not have been returning
you could not have been returning
she could not have been returning
we could not have been returning
you could not have been returning
they could not have been returning	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I return?
could you return?
could she return?
could we return?
could you return?
could they return? 	could I be returning?
could you be returning?
could she be returning?
could we be returning?
could you be returning?
could they be returning? 	could I have returned?
could you have returned?
could she have returned?
could we have returned?
could you have returned?
could they have returned? 	could I have been returning?
could you have been returning?
could she have been returning?
could we have been returning?
could you have been returning?
could they have been returning? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I not return?
could you not return?
could she not return?
could we not return?
could you not return?
could they not return? 	could I not be returning?
could you not be returning?
could she not be returning?
could we not be returning?
could you not be returning?
could they not be returning? 	could I not have returned?
could you not have returned?
could she not have returned?
could we not have returned?
could you not have returned?
could they not have returned? 	could I not have been returning?
could you not have been returning?
could she not have been returning?
could we not have been returning?
could you not have been returning?
could they not have been returning?