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 mayn't refute you mayn't refute he mayn't refute we mayn't refute you mayn't refute they mayn't refute
V-ing form
I mayn't be refuting you mayn't be refuting he mayn't be refuting we mayn't be refuting you mayn't be refuting they mayn't be refuting
Perfect
I mayn't have refuted you mayn't have refuted he mayn't have refuted we mayn't have refuted you mayn't have refuted they mayn't have refuted
V-ing perfect
I mayn't have been refuting you mayn't have been refuting he mayn't have been refuting we mayn't have been refuting you mayn't have been refuting they mayn't 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
mayn't I refute? mayn't you refute? mayn't he refute? mayn't we refute? mayn't you refute? mayn't they refute?
V-ing form
mayn't I be refuting? mayn't you be refuting? mayn't he be refuting? mayn't we be refuting? mayn't you be refuting? mayn't they be refuting?
Perfect
mayn't I have refuted? mayn't you have refuted? mayn't he have refuted? mayn't we have refuted? mayn't you have refuted? mayn't they have refuted?
V-ing perfect
mayn't I have been refuting? mayn't you have been refuting? mayn't he have been refuting? mayn't we have been refuting? mayn't you have been refuting? mayn't they have been refuting?