could double-book double-book
Regular verb: double-book double-book - double-book double-booked- double-book double-booked

, this verb may not exist. Conjugation is given as example.

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

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

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

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