may referee
Verbo regular: referee - refereed- refereed

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I may referee
you may referee
he may referee
we may referee
you may referee
they may referee 	I may be refereeing
you may be refereeing
he may be refereeing
we may be refereeing
you may be refereeing
they may be refereeing	I may have refereed
you may have refereed
he may have refereed
we may have refereed
you may have refereed
they may have refereed	I may have been refereeing
you may have been refereeing
he may have been refereeing
we may have been refereeing
you may have been refereeing
they may have been refereeing	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I may not referee
you may not referee
he may not referee
we may not referee
you may not referee
they may not referee 	I may not be refereeing
you may not be refereeing
he may not be refereeing
we may not be refereeing
you may not be refereeing
they may not be refereeing	I may not have refereed
you may not have refereed
he may not have refereed
we may not have refereed
you may not have refereed
they may not have refereed	I may not have been refereeing
you may not have been refereeing
he may not have been refereeing
we may not have been refereeing
you may not have been refereeing
they may not have been refereeing	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
may I referee?
may you referee?
may he referee?
may we referee?
may you referee?
may they referee? 	may I be refereeing?
may you be refereeing?
may he be refereeing?
may we be refereeing?
may you be refereeing?
may they be refereeing? 	may I have refereed?
may you have refereed?
may he have refereed?
may we have refereed?
may you have refereed?
may they have refereed? 	may I have been refereeing?
may you have been refereeing?
may he have been refereeing?
may we have been refereeing?
may you have been refereeing?
may they have been refereeing? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
may I not referee?
may you not referee?
may he not referee?
may we not referee?
may you not referee?
may they not referee? 	may I not be refereeing?
may you not be refereeing?
may he not be refereeing?
may we not be refereeing?
may you not be refereeing?
may they not be refereeing? 	may I not have refereed?
may you not have refereed?
may he not have refereed?
may we not have refereed?
may you not have refereed?
may they not have refereed? 	may I not have been refereeing?
may you not have been refereeing?
may he not have been refereeing?
may we not have been refereeing?
may you not have been refereeing?
may they not have been refereeing?