Conjugación del verbo inglés
COULD REFEREE

Verbo regular: referee - refereed - refereed

Afirmación

Forma simple	Forma con V-ing
I could referee you could referee he could referee we could referee you could referee they could referee	I could be refereeing you could be refereeing he could be refereeing we could be refereeing you could be refereeing they could be refereeing
Perfecto	Perfecto con V-ing
I could have refereed you could have refereed he could have refereed we could have refereed you could have refereed they could have refereed	I could have been refereeing you could have been refereeing he could have been refereeing we could have been refereeing you could have been refereeing they could have been refereeing

Negación

Forma simple	Forma con V-ing
I could not referee you could not referee he could not referee we could not referee you could not referee they could not referee	I could not be refereeing you could not be refereeing he could not be refereeing we could not be refereeing you could not be refereeing they could not be refereeing
Perfecto	Perfecto con V-ing
I could not have refereed you could not have refereed he could not have refereed we could not have refereed you could not have refereed they could not have refereed	I could not have been refereeing you could not have been refereeing he could not have been refereeing we could not have been refereeing you could not have been refereeing they could not have been refereeing

Forma interrogativa

Forma simple	Forma con V-ing
could I referee? could you referee? could he referee? could we referee? could you referee? could they referee?	could I be refereeing? could you be refereeing? could he be refereeing? could we be refereeing? could you be refereeing? could they be refereeing?
Perfecto	Perfecto con V-ing
could I have refereed? could you have refereed? could he have refereed? could we have refereed? could you have refereed? could they have refereed?	could I have been refereeing? could you have been refereeing? could he have been refereeing? could we have been refereeing? could you have been refereeing? could they have been refereeing?

Forma interro-negativa

Forma simple	Forma con V-ing
could I not referee? could you not referee? could he not referee? could we not referee? could you not referee? could they not referee?	could I not be refereeing? could you not be refereeing? could he not be refereeing? could we not be refereeing? could you not be refereeing? could they not be refereeing?
Perfecto	Perfecto con V-ing
could I not have refereed? could you not have refereed? could he not have refereed? could we not have refereed? could you not have refereed? could they not have refereed?	could I not have been refereeing? could you not have been refereeing? could he not have been refereeing? could we not have been refereeing? could you not have been refereeing? could they not have been refereeing?