may refute
Regular verb: refute - refuted- refuted

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