English verb conjugation
MAY REF

Regular verb: ref - refed - refed

Affirmation

Simple form	V-ing form
I may ref you may ref she may ref we may ref you may ref they may ref	I may be refing you may be refing she may be refing we may be refing you may be refing they may be refing
Perfect	V-ing perfect
I may have refed you may have refed she may have refed we may have refed you may have refed they may have refed	I may have been refing you may have been refing she may have been refing we may have been refing you may have been refing they may have been refing

Negation

Simple form	V-ing form
I may not ref you may not ref she may not ref we may not ref you may not ref they may not ref	I may not be refing you may not be refing she may not be refing we may not be refing you may not be refing they may not be refing
Perfect	V-ing perfect
I may not have refed you may not have refed she may not have refed we may not have refed you may not have refed they may not have refed	I may not have been refing you may not have been refing she may not have been refing we may not have been refing you may not have been refing they may not have been refing

Interrogative form

Simple form	V-ing form
may I ref? may you ref? may she ref? may we ref? may you ref? may they ref?	may I be refing? may you be refing? may she be refing? may we be refing? may you be refing? may they be refing?
Perfect	V-ing perfect
may I have refed? may you have refed? may she have refed? may we have refed? may you have refed? may they have refed?	may I have been refing? may you have been refing? may she have been refing? may we have been refing? may you have been refing? may they have been refing?

Interro-negative form

Simple form	V-ing form
may I not ref? may you not ref? may she not ref? may we not ref? may you not ref? may they not ref?	may I not be refing? may you not be refing? may she not be refing? may we not be refing? may you not be refing? may they not be refing?
Perfect	V-ing perfect
may I not have refed? may you not have refed? may she not have refed? may we not have refed? may you not have refed? may they not have refed?	may I not have been refing? may you not have been refing? may she not have been refing? may we not have been refing? may you not have been refing? may they not have been refing?