English verb conjugation
MAY REFEREE

Regular verb: referee - refereed - refereed

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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
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
Perfect	V-ing perfect
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
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?
Perfect	V-ing perfect
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
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?
Perfect	V-ing perfect
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?