I may refute you may refute he may refute we may refute you may refute they may refute
V-ing form
I may be refuting you may be refuting he may be refuting we may be refuting you may be refuting they may be refuting
Perfect
I may have refuted you may have refuted he may have refuted we may have refuted you may have refuted they may have refuted
V-ing perfect
I may have been refuting you may have been refuting he may have been refuting we may have been refuting you may have been refuting they may have been refuting
Negation
Simple form
I may not refute you may not refute he may not refute we may not refute you may not refute they may not refute
V-ing form
I may not be refuting you may not be refuting he may not be refuting we may not be refuting you may not be refuting they may not be refuting
Perfect
I may not have refuted you may not have refuted he may not have refuted we may not have refuted you may not have refuted they may not have refuted
V-ing perfect
I may not have been refuting you may not have been refuting he may not have been refuting we may not have been refuting you may not have been refuting they may not have been refuting
Interrogative form
Simple form
may I refute? may you refute? may he refute? may we refute? may you refute? may they refute?
V-ing form
may I be refuting? may you be refuting? may he be refuting? may we be refuting? may you be refuting? may they be refuting?
Perfect
may I have refuted? may you have refuted? may he have refuted? may we have refuted? may you have refuted? may they have refuted?
V-ing perfect
may I have been refuting? may you have been refuting? may he have been refuting? may we have been refuting? may you have been refuting? may they have been refuting?
Interro-negative form
Simple form
may I not refute? may you not refute? may he not refute? may we not refute? may you not refute? may they not refute?
V-ing form
may I not be refuting? may you not be refuting? may he not be refuting? may we not be refuting? may you not be refuting? may they not be refuting?
Perfect
may I not have refuted? may you not have refuted? may he not have refuted? may we not have refuted? may you not have refuted? may they not have refuted?
V-ing perfect
may I not have been refuting? may you not have been refuting? may he not have been refuting? may we not have been refuting? may you not have been refuting? may they not have been refuting?