may referee
Regular verb: referee - refereed- refereed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I may referee
you may referee
she may referee
we may referee
you may referee
they may referee 	I may be refereeing
you may be refereeing
she may be refereeing
we may be refereeing
you may be refereeing
they may be refereeing	I may have refereed
you may have refereed
she 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
she may have been refereeing
we may have been refereeing
you may have been refereeing
they may have been refereeing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mayn't referee
you mayn't referee
she mayn't referee
we mayn't referee
you mayn't referee
they mayn't referee 	I mayn't be refereeing
you mayn't be refereeing
she mayn't be refereeing
we mayn't be refereeing
you mayn't be refereeing
they mayn't be refereeing	I mayn't have refereed
you mayn't have refereed
she mayn't have refereed
we mayn't have refereed
you mayn't have refereed
they mayn't have refereed	I mayn't have been refereeing
you mayn't have been refereeing
she mayn't have been refereeing
we mayn't have been refereeing
you mayn't have been refereeing
they mayn't have been refereeing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
may I referee?
may you referee?
may she referee?
may we referee?
may you referee?
may they referee? 	may I be refereeing?
may you be refereeing?
may she be refereeing?
may we be refereeing?
may you be refereeing?
may they be refereeing? 	may I have refereed?
may you have refereed?
may she 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 she have been refereeing?
may we have been refereeing?
may you have been refereeing?
may they have been refereeing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mayn't I referee?
mayn't you referee?
mayn't she referee?
mayn't we referee?
mayn't you referee?
mayn't they referee? 	mayn't I be refereeing?
mayn't you be refereeing?
mayn't she be refereeing?
mayn't we be refereeing?
mayn't you be refereeing?
mayn't they be refereeing? 	mayn't I have refereed?
mayn't you have refereed?
mayn't she have refereed?
mayn't we have refereed?
mayn't you have refereed?
mayn't they have refereed? 	mayn't I have been refereeing?
mayn't you have been refereeing?
mayn't she have been refereeing?
mayn't we have been refereeing?
mayn't you have been refereeing?
mayn't they have been refereeing?