may double-book
Regular verb: double-book - double-booked- double-booked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I may double-book
you may double-book
he may double-book
we may double-book
you may double-book
they may double-book 	I may be double-booking
you may be double-booking
he may be double-booking
we may be double-booking
you may be double-booking
they may be double-booking	I may have double-booked
you may have double-booked
he may have double-booked
we may have double-booked
you may have double-booked
they may have double-booked	I may have been double-booking
you may have been double-booking
he may have been double-booking
we may have been double-booking
you may have been double-booking
they may have been double-booking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mayn't double-book
you mayn't double-book
he mayn't double-book
we mayn't double-book
you mayn't double-book
they mayn't double-book 	I mayn't be double-booking
you mayn't be double-booking
he mayn't be double-booking
we mayn't be double-booking
you mayn't be double-booking
they mayn't be double-booking	I mayn't have double-booked
you mayn't have double-booked
he mayn't have double-booked
we mayn't have double-booked
you mayn't have double-booked
they mayn't have double-booked	I mayn't have been double-booking
you mayn't have been double-booking
he mayn't have been double-booking
we mayn't have been double-booking
you mayn't have been double-booking
they mayn't have been double-booking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
may I double-book?
may you double-book?
may he double-book?
may we double-book?
may you double-book?
may they double-book? 	may I be double-booking?
may you be double-booking?
may he be double-booking?
may we be double-booking?
may you be double-booking?
may they be double-booking? 	may I have double-booked?
may you have double-booked?
may he have double-booked?
may we have double-booked?
may you have double-booked?
may they have double-booked? 	may I have been double-booking?
may you have been double-booking?
may he have been double-booking?
may we have been double-booking?
may you have been double-booking?
may they have been double-booking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mayn't I double-book?
mayn't you double-book?
mayn't he double-book?
mayn't we double-book?
mayn't you double-book?
mayn't they double-book? 	mayn't I be double-booking?
mayn't you be double-booking?
mayn't he be double-booking?
mayn't we be double-booking?
mayn't you be double-booking?
mayn't they be double-booking? 	mayn't I have double-booked?
mayn't you have double-booked?
mayn't he have double-booked?
mayn't we have double-booked?
mayn't you have double-booked?
mayn't they have double-booked? 	mayn't I have been double-booking?
mayn't you have been double-booking?
mayn't he have been double-booking?
mayn't we have been double-booking?
mayn't you have been double-booking?
mayn't they have been double-booking?