Conjugación del verbo inglés
CAN REFEREE

Verbo regular: referee - refereed - refereed

Afirmación

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

Negación

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

Forma interrogativa

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

Forma interro-negativa

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