English verb conjugation
MAY REFER

Regular verb: refer - referred - referred

Affirmation

Simple form	V-ing form
I may refer you may refer she may refer we may refer you may refer they may refer	I may be referring you may be referring she may be referring we may be referring you may be referring they may be referring
Perfect	V-ing perfect
I may have referred you may have referred she may have referred we may have referred you may have referred they may have referred	I may have been referring you may have been referring she may have been referring we may have been referring you may have been referring they may have been referring

Negation

Simple form	V-ing form
I mayn't refer you mayn't refer she mayn't refer we mayn't refer you mayn't refer they mayn't refer	I mayn't be referring you mayn't be referring she mayn't be referring we mayn't be referring you mayn't be referring they mayn't be referring
Perfect	V-ing perfect
I mayn't have referred you mayn't have referred she mayn't have referred we mayn't have referred you mayn't have referred they mayn't have referred	I mayn't have been referring you mayn't have been referring she mayn't have been referring we mayn't have been referring you mayn't have been referring they mayn't have been referring

Interrogative form

Simple form	V-ing form
may I refer? may you refer? may she refer? may we refer? may you refer? may they refer?	may I be referring? may you be referring? may she be referring? may we be referring? may you be referring? may they be referring?
Perfect	V-ing perfect
may I have referred? may you have referred? may she have referred? may we have referred? may you have referred? may they have referred?	may I have been referring? may you have been referring? may she have been referring? may we have been referring? may you have been referring? may they have been referring?

Interro-negative form

Simple form	V-ing form
mayn't I refer? mayn't you refer? mayn't she refer? mayn't we refer? mayn't you refer? mayn't they refer?	mayn't I be referring? mayn't you be referring? mayn't she be referring? mayn't we be referring? mayn't you be referring? mayn't they be referring?
Perfect	V-ing perfect
mayn't I have referred? mayn't you have referred? mayn't she have referred? mayn't we have referred? mayn't you have referred? mayn't they have referred?	mayn't I have been referring? mayn't you have been referring? mayn't she have been referring? mayn't we have been referring? mayn't you have been referring? mayn't they have been referring?