could overbook
Regular verb: overbook - overbooked- overbooked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could overbook
you could overbook
he could overbook
we could overbook
you could overbook
they could overbook 	I could be overbooking
you could be overbooking
he could be overbooking
we could be overbooking
you could be overbooking
they could be overbooking	I could have overbooked
you could have overbooked
he could have overbooked
we could have overbooked
you could have overbooked
they could have overbooked	I could have been overbooking
you could have been overbooking
he could have been overbooking
we could have been overbooking
you could have been overbooking
they could have been overbooking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not overbook
you could not overbook
he could not overbook
we could not overbook
you could not overbook
they could not overbook 	I could not be overbooking
you could not be overbooking
he could not be overbooking
we could not be overbooking
you could not be overbooking
they could not be overbooking	I could not have overbooked
you could not have overbooked
he could not have overbooked
we could not have overbooked
you could not have overbooked
they could not have overbooked	I could not have been overbooking
you could not have been overbooking
he could not have been overbooking
we could not have been overbooking
you could not have been overbooking
they could not have been overbooking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I overbook?
could you overbook?
could he overbook?
could we overbook?
could you overbook?
could they overbook? 	could I be overbooking?
could you be overbooking?
could he be overbooking?
could we be overbooking?
could you be overbooking?
could they be overbooking? 	could I have overbooked?
could you have overbooked?
could he have overbooked?
could we have overbooked?
could you have overbooked?
could they have overbooked? 	could I have been overbooking?
could you have been overbooking?
could he have been overbooking?
could we have been overbooking?
could you have been overbooking?
could they have been overbooking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not overbook?
could you not overbook?
could he not overbook?
could we not overbook?
could you not overbook?
could they not overbook? 	could I not be overbooking?
could you not be overbooking?
could he not be overbooking?
could we not be overbooking?
could you not be overbooking?
could they not be overbooking? 	could I not have overbooked?
could you not have overbooked?
could he not have overbooked?
could we not have overbooked?
could you not have overbooked?
could they not have overbooked? 	could I not have been overbooking?
could you not have been overbooking?
could he not have been overbooking?
could we not have been overbooking?
could you not have been overbooking?
could they not have been overbooking?